Portland Psychotherapy Clinic, Research, & Training Center, Portland, Oregon;
Benjamin Pierce
Department of Psychology, Utah State University
Michael E. Levin
Department of Psychology, Utah State University
Acknowledgement: This research was supported by internal funding from the Portland Psychotherapy Clinic, Research, & Training Center. The authors thank Christina Chwyl for her feedback on drafts. Portions of this data were previously presented at the Annual Conference of the Association for Contextual Behavioral Science in Minneapolis, Minnesota.
Research has repeatedly shown that alcohol use is triggered by negative affect (NA) in many individuals (
One process that may help clarify how and when NA may precipitate drinking is experiential avoidance (EA), a broad class of coping behavior that refers to the tendency to control, suppress, or otherwise alter the form, frequency, or intensity of unwanted internal experiences, such as negative affective states (
However, to date this research has only been conducted using trait-like measures assessing the general tendency to engage in EA and patterns of problem drinking. Such studies indicate the potential role of EA in problem drinking but do not answer critical questions that would further inform prevention and treatment, such as how engaging in EA leads to alcohol use problems and under what conditions this occurs (i.e., when is engaging in EA problematic?). These questions might be best answered using intensive longitudinal designs that provide a more fine-grained analysis at both the between-person (i.e., trait) and within-person (i.e., state) level. Although there is some evidence that between-person differences in EA predict drinking and alcohol problems (i.e., EA predicts who is at greater risk for alcohol problems), little is known about within-person fluctuations in EA or temporal links between state changes in EA and alcohol (i.e., when and how people are at risk for alcohol problems). This is important to investigate empirically as some studies have shown that within-person and between-person associations with alcohol consumption can differ (
EA fluctuates from day-to-day (
The current study sought to gain a more complete understanding of how EA contributes to alcohol use by modeling both within-person (state) and between-person (trait) variations in EA and NA as well as their interaction. We recruited a community sample of light-to-heavy drinkers to allow us to assess the effects of EA and NA at every level of drinking behavior. Following a baseline assessment, participants were asked to submit data on EA, mood, and drinking every day for 21 days. This daily process approach allowed us to model both between-persons and daily within-persons fluctuations in EA and NA as they predicted drinking behavior in our sample. Based on previous studies (e.g.,
In addition, we modeled social drinking separately from solitary drinking. This was because both theory (
As EA is primarily a response to aversive affect and some studies have found that the relationship between substance use and EA may depend upon the level of NA (
Based these studies, we anticipated that the effects of state, within-participant changes in EA would depend upon a person’s level of negative affect. Specifically, we hypothesized that daily fluctuations in EA would more strongly predict drinking among participants generally higher in NA and that daily fluctuations in EA might interact with daily fluctuations in NA to predict drinking behavior. Finally, we expected that these effects would be larger for solitary drinking versus social drinking, as the former has been more consistently associated with coping in response to unwanted affective states.
A sample of 238 drinkers were recruited for the research study, and 206 participants were included in the final analysis sample for the study. Reasons for exclusion included completing only one diary response (n = 8), reporting extreme drinking that was over 5 SD above other participants (n = 3; drinking on average 20 or more drinks a night), reporting no drinking at all during the study period (n = 13), or not responding to any of the diaries (n = 14). The average age of participants in the final analysis sample was 33.6 years (SD = 11.8 years, range = 18–75), and 69.1% identified as female, 29.4% as male, and 1.5% as “other” gender. When asked about their race/ethnicity, 78.5% of participants identified as White, 11.2% multiracial, 3.9% Black or African American, 2.9% Hispanic, 1.0% Asian, 0.5% American Indian or Alaska Native, and 1.0% “other” race or ethnicity. With regard to marital status, 62.1% of participants identified being “single,” with 21.8% currently married or partnered, 13.1% divorced or separated, and 1.9% “widow” or “widower.” On average, participants completed 15.25 years of education (SD = 2.25), with the majority (98.3%) completing high school and over half (59.2%) completing 4 or more years of education after high school.
The study design was approved by a federally registered institutional review board. Participants were screened via phone or e-mail to ensure they had at least one drink per week over the last 2 weeks. Other inclusion criteria included daily access to the Internet, not currently pregnant, ability to travel to the research center, being at least 18 years of age, and the ability to read English. Following the phone screen, participants were scheduled for an in-person assessment; participants were required to be sober at the appointment. Participants provided informed consent, whereupon they completed baseline questionnaires, only some of which we report in this paper. Participants were then trained how to use the online survey and were instructed to complete the survey remotely on a daily basis for the next 21 days, between the hours of 4:00 p.m. and 6:00 p.m. This daily survey included assessment of NA and EA for the current day, as well as alcohol use the prior evening. We only included data for entries received between 3:50 p.m. and 6:10 p.m. We stayed in contact with participants to provide feedback about their diary completion rates and to troubleshoot any obstacles. Participant compensation was based on the portion of the study they completed, with a maximum compensation amount of $50. On average, participants completed 14.70 diaries. To conduct study analyses, we required back-to-back diaries, of which we obtained an average of 11.71 (SD = 5.77) per participant for a total of 2,271 diaries.
Daily negative affect
To assess mood, participants reported how they felt over the course of the day (since waking up that day until survey completion that day, 4–6 p.m.) with items from the Positive and NA Scale (
Daily EA
To assess participants’ daily efforts to avoid, suppress, or otherwise attempt to control their affective experiences, we created a three-item measure of EA (α for between = .74; α for within = .75) and averaged across items to compute participants’ total scores (M = 2.14, SD = 1.09). We selected the three highest loading items from the daily measure of EA developed in
Drinks alone/social/total
Participants reported both the number of alcoholic beverages they consumed “while alone” and “while interacting with others” the prior evening (i.e., after completing their last diary but before waking up that day). Participants were presented with familiar types and volumes of alcoholic beverages and instructed to enter the number of drinks consumed for each type; we transformed the number of each type of beverage into standard drinks (defined as 14g of “pure” alcohol) based on typical alcohol concentrations in each drink type and summed these to obtain the total standard drinks within each time period.
Alcohol Use Disorders Identification Test
The Alcohol Use Disorders Identification Test (AUDIT;
Acceptance and Action Questionnaire–II
The Acceptance and Action Questionnaire–II (AAQ-II;
We conducted three sets of analyses to assess how both state (within-participant) and trait (between-participants) variation in EA and NA affected social and solitary drinking. The unit of our analysis was whether a participant drank on a given evening as well as how much the participant drank if they chose to do so, as predicted by variables measured earlier in the evening. Each predictor variable was assessed based on the participant’s reports on the day of the target evening (i.e., in the afternoon prior to that evening). Drinking behavior on the target evening was reported the next day in the subsequent diary entry (i.e., on the day after the target evening). As such, both the EA and NA variables were lagged from the daily diary at day (d − 1) relative to when the daily dairy report of drinking occurred.
All analyses were performed using MPlus, Version 8.0 (
To facilitate interpretation of the intercepts, all within-persons predictors were centered around the participant mean for that predictor and all between-persons predictors were centered around the grand mean of the predictor. This means that intercepts reflect the average probability of not drinking and the average count of drinks consumed alone and socially, when all other predictors were held at the mean of the sample.
As this is a new area of investigation, the first set of models examined the roles of state and trait variability in NA and EA predicting solitary drinking (Model 1) and social drinking (Model 2). We expected the effects of EA and NA at the state and trait levels to independently predict drinking, and to be most strongly predictive of solitary drinking,.
Because EA is hypothesized to be a response to negative affective states, we hypothesized that it may interact with these states to predict drinking. Specifically, we hypothesized that state variability in EA may serve as a more robust predictor of solitary drinking in the context of elevated daily NA (i.e., state negative affect) as well as for those individuals who tend toward more ongoing and pervasive NA (i.e., trait negative affect). Therefore, the second and third set of models were constructed to examine the effects of state variability in EA as a predictor of drinking behavior, dependent on a person’s daily negative affective experiences (Models 3 and 4) and trait levels of NA (Models 5 and 6). The dependency of the relation between state EA and drinking behavior on state NA was modeled through the inclusion of within-persons interaction between state EA and state NA predicting solitary or social drinking. Conversely, the dependency of the relation between state EA and drinking on participants’ trait levels of NA was modeled through a cross-level interaction between NA and EA predicting either drinking behavior.
The baseline AUDIT was included to allow comparison of this sample to other samples and was not included in daily diary statistical models below. AUDIT scores in this sample (M = 9.33, SD = 5.68) indicated that 43.2% of the current sample could be identified as engaging in “problematic” use of alcohol based on a cutoff of 8 or more (
Zero-order correlations on aggregated (between-persons) variables from the daily diary are reported in
To assess convergent validity of our daily measure of EA, we correlated participants’ average EA score based on the daily measure with the AAQ-II and found a correlation of r(205) = .35, p < .001. To assess the construct validity of the EA and NA items, two multilevel confirmatory factor analysis models (ML-CFAs) were fit to the data. The first ML-CFA assumed that a single latent factor at both the within and between-person levels accounted for variance across all 13 EA and NA items. The second ML-CFA included two latent factors at the within- and between-person levels of the model, with the first latent factor explaining variance in the 10 NA items and the second latent factor explaining variance in the three EA items at each level. A chi-square difference test for nested models was used to compare the single-factor and the two-factor models to determine whether the EA and NA items covaried with the same or distinct latent constructs. This test was highly significant, with χ
The results of our first two models are presented in
Considering social drinking (Model 1), after controlling for state and trait variability in EA, both within- and between-person variability in NA predicted the likelihood of drinking socially. People who had more trait NA were less likely to drink socially than those with lower trait negative affect, such that a one standard-deviation increase in trait NA was associated with 25% fewer nights on which alcohol was consumed in a social context. In addition, as state NA increased on a given day, the likelihood of drinking socially decreased, such that participants were 16% less likely to drink socially per standard deviation increase in state NA (relative to that person’s average negative affect). NA did not predict the amount consumed once drinking was initiated. EA did not significantly predict social drinking at any level. The overall picture is that higher NA predicted a lower likelihood of social drinking at both a trait and state level, but that NA did not tend to affect how much a person drank socially.
Considering solitary drinking (Model 2), between-person, trait NA (after controlling for EA) predicted the amount consumed alone that evening once drinking was initiated. Those individuals who had higher trait NA tended to drink greater quantities in the evening when they had started drinking, compared to those who had lower trait negative affect. Specifically, for each standard deviation higher in trait negative affect, participants consumed 30% more alcohol when they did drink. Neither state nor trait NA predicted the likelihood of solitary drinking, nor did state variability in NA predict the amount of alcohol consumed in solitary contexts. After controlling for negative affect, within-person variability in EA did not predict the likelihood of solitary drinking, but between-person, trait differences in EA did. In other words, those with higher trait EA tended to be more likely to drink alone in the evening than those with lower trait EA. Specifically, for each standard-deviation increase in average EA, participants drank alone on 29% more nights. Neither between- or within-person variability in EA predicted how much a person drank alone.
To summarize the results of Models 1–2, only NA predicted social drinking, with more NA at both state and trait levels predicting a lower probability of social drinking. EA had no effects on social drinking. In contrast, solitary drinking was predicted by both trait NA and trait EA. Essentially, people high in trait EA tended to drink alone more often, whereas people higher in trait negative affected tended to consume greater quantities when they did drink alone. State variability in NA and EA had no significant relationship with solitary drinking that evening. Thus, those who were drinking the most in solitary contexts (in terms of both frequency and quantity) were participants who had high trait levels of both NA and EA.
Overall, Models 1–2 suggest that NA has an influence at both the state and trait levels, with EA only having an influence at a trait level. In addition, these models suggest that EA is only linked to solitary drinking, not social drinking. Finally, both EA and NA appeared to explain independent facets of solitary drinking, even after controlling for each other.
Models 3–4 examined whether daily fluctuations in participants’ NA moderated the association between concurrent fluctuations in EA and drinking. These models assessed whether state EA was more strongly associated with either solitary or social drinking in the context of concurrent state deviations in NA from participants’ average NA scores. If state fluctuations in EA are differentially associated with later solitary or social drinking in the context of moments of heightened negative affect, relative to participant’s typical negative affective experiences, then there should be a significant within-person interaction between NA and EA.
The results of Models 3–4 are presented in
Models 5–6 were constructed to test whether a relation between state level EA and solitary drinking might be found if trait levels of NA were taken into account. If state fluctuations in EA are more influential on solitary drinking for people who tend toward more negative affect, then a statistically significant cross-level interaction should be identified in this model.
The results of this model are presented in
Thus, the overall pattern is that for people with high trait negative affect, state fluctuation in EA bears little relation to their likelihood of drinking alone. However, if solitary drinking is initiated, higher levels of EA on a given day predict the tendency to drink more among people with high trait negative affect. For people with low trait negative affect, higher state EA is associated with an increased likelihood of drinking alone, but with attenuated amounts once drinking is initiated.
The present collection of findings clarify how both EA and NA are related to subsequent alcohol use through a more fine-grained analysis of both within- and between-person level predictors of the quantity and likelihood of drinking alone and socially. As discussed in more detail below, overall the results indicate that (a) EA predicts solitary drinking, but not social drinking; (b) participants who tend to engage in EA more often (trait-level) are more likely to drink alone, but do not consume more alcohol when alone; and (c) the effect of daily fluctuations in EA (state-level) on solitary drinking depends on participants’ average levels of NA (trait-level). These results highlight possible risk factors for problematic or excessive drinking behavior, while also demonstrating person-specific effects of state fluctuations in EA. We first discuss the results for solitary drinking in more detail, which EA did predict, followed by social drinking, which EA did not predict.
At a between-person level, both trait NA and trait EA predicted solitary drinking. Participants who were high in trait EA tended to drink more often whereas those who were high in trait negative affected tended to consume greater quantities when they did drink. Thus, those who were drinking alone the most (in terms of both frequency and amount) were those participants who were high on both trait NA and trait EA (i.e., those who report a higher average level of NA and EA). This suggests that chronically high levels of EA may lead to the habit of solitary drinking as a means of avoiding aversive inner experiences, while trait NA seems to drive the amount of alcohol consumed once drinking alone has begun. These results align with those of other authors (
Contrary to predictions, daily fluctuations in EA (state-level) did not predict solitary drinking in main effect models. This result appears consistent with two recent studies (
Based on the idea that EA is a response to negative affective states (
A second set of models (see
Cross-level interactions showed that among those high in trait negative affect, higher levels of EA on a given day bore little relation to their likelihood of drinking alone that evening (see
Empirically, our results are consistent with previous studies indicating the interaction between trait negative affectivity and EA is a stronger predictor of problem drinking (
We now move on to interpreting the results for those who tended toward lower levels of trait NA. Compared to high NA individuals, these individuals were no more or less likely to drink alone but did tend to drink less alcohol once drinking began. However, these results were moderated by daily levels of EA. When EA was higher on a given day, low NA individuals tended to increase their likelihood of drinking alone. At the same time, when experiencing higher than usual EA on a given day, they appeared to slightly temper their already low quantities consumed in a typical episode, moving from about 2.7 drinks at a mean level of EA to about 1.3 drinks at high levels of EA. Thus, although low NA individuals were more likely to drink on high EA days, they still didn’t drink amounts that were likely to be harmful. These results may reflect a tendency to respond to relatively rare experiences of NA with attempts to escape via drinking, perhaps indicating a more contextually sensitive and adaptive deployment of drinking to escape. Because parallel effects were not found for social drinking, it does not appear that people low in NA simply shift their drinking away from social contexts when experiencing high EA, but actually increase their rate of having a drink or two alone.
What is more puzzling with these low trait NA individuals are the days where they reported extremely low levels of EA and where models predicted low level probabilities of drinking, but high amounts consumed if drinking were to occur. We could see no theoretical reason to think that a combination of low trait NA and low daily EA would lead to near binge levels of consumption. In response to this finding we further examined the distribution of our data and identified that at low NA, within-person EA was relatively kurtotic, meaning that people didn’t show much day to day variability in EA at that end of trait NA. In contrast, at higher levels of NA, there was more variability in EA. Given this, the slope shown for low NA in
These results highlight trait NA as one important moderating factor that predicts when engaging in daily EA is harmful. EA might be a particularly important clinical target for SUD clients who experience high negative affect, for example, those with co-occurring mood and anxiety disorders. This idea aligns with other data showing that EA can interact with NA to predict substance use-related outcomes. For example,
There were no significant relations between EA and social drinking in any model, at either a between-persons or within-persons level. This finding adds to between-subjects research showing that the use of alcohol to cope with NA is generally not associated with social drinking (
Overall, our results are consistent with the idea that social drinking is less characterized by an avoidant function. In other words, social drinking may more often serve to increase positive mood or be triggered by external cues compared to solitary drinking such as in
Our study contributes to refining tension-reduction (
Characteristics of this sample should be considered when discussing generalization. The sample was largely white, female, and fairly educated. About 43% of the sample was engaged in problematic levels of drinking. For example, it’s unclear whether these results would generalize to a college student sample, where it is likely that drinking occurs much more dominantly in social contexts than in our sample. Similarly, as this study included nonproblem drinkers, it is unclear the degree to which predicted patterns could reflect moderate, nonproblematic versus problematic drinking.
Results should also be interpreted in the context of the relatively narrow assessment of EA used in this study and its relatively low internal reliability (α for between = .74; α for within = .75). The measure we used was based on a previously published assessment of daily EA that showed good preliminary properties (
It is also important to note that this study was not designed to examine whether EA mediates the relationship between NA and drinking. As a first step, we sought to determine the contexts in which within and between variability in EA predict alcohol consumption. The use of moderation and not mediational analyses might be particularly relevant in understanding the lack of significant interaction effects between day-to-day EA and day-to-day negative affect. One possibility is that within-subject, daily relationships might be better modeled through mediational models wherein daily increases in NA are seen to lead to daily increases in EA, which then might subsequently result in evening drinking. Another possibility is moderated mediation wherein mediation of relationships between daily changes in NA and drinking via daily changes in EA only occurs for those with heightened trait EA (
Another limitation of this study is that the item response options for our measure of NA made us unable to differentiate between days with low NA and those with a complete absence of NA. Because our EA items presume some level of negative affect, some responses to the EA measures could be invalid if individuals had a complete absence of NA on a given day. We also noted that day-to-day variability in EA was less for participants with lower trait negative affect. This implies that future studies might want to exclude EA scores on days when there is absolutely no NA to respond to. We were also unable to differentiate between different types of negative affect, such as anxiety versus depression, which future researchers may benefit from doing.
Finally, it is noteworthy that a potential limitation on finding within-person effects was imposed through the requirement of obtaining back-to-back observations on all within-person variables. Certain participants may have responded several times yet may have missed days of reporting between observations, such that may have attenuated the effects observed at the within-person level yet nevertheless permitted calculation of between-person, average values. This would have reduced our power to detect within-person associations due to having some participants with limited within-person data with which to estimate such effects.
Together, these results indicate that it is the combination of high trait NA and higher EA, both at a trait and a state level, that predicts the highest levels of solitary drinking. In addition, these results suggest that daily variability in EA is most tied to problematic levels of drinking only among those with higher levels of negative affect. These results lend support to treatments for SUD, such as acceptance and commitment therapy (
Fine grained and detailed analyses of drinking contexts, as well as the inclusion of both between- and within-person predictors are important in developing more targeted interventions. We hope that this study will spur more research of this sort that can support translational research efforts.
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Submitted: July 10, 2019 Revised: December 11, 2019 Accepted: December 19, 2019