Participants
The sample size was determined based on similar ESM studies on strategy selection and ER motives (English et al., 2017; Ortner et al., 2022). One hundred and sixty-nine young adults were recruited by advertising on social media. However, seven participants did not respond to any of the ESM prompts to provide data, and seven participants responded to less than 30% of the prompts(Hiekkaranta et al., 2021); these 14 participants were excluded from the study. The final sample constituted 155 participants (136 women; mean age = 20.07, SD = 2.24, range 17 to 31 years). The study was conducted in accordance with the Declaration of Helsinki and was approved by the ethics review board of the Central China Normal University. Written informed content was obtained from all participants. Upon completion of the study, participants were compensated financially for their time and effort.
Procedure and measures
The study was carried out between November and December in 2022. Participants were invited to visit the laboratory to complete baseline questionnaires, receive information about the ESM procedure, and complete practice ESM questionnaires. Due to the COVID-19 pandemic, 32 of the 155 participants were unable to visit the laboratory. These participants completed an online version of the baseline questionnaires, participated in a briefing session by phone, and subsequently filled out the practice ESM questionnaires.
The ESM period lasted seven consequent days. Participants were semi-randomly prompted by a beep five times each day, from 10 a.m. to 10 p.m., with an interval of at least 90 minutes between two consecutive prompts. After receiving the weblink on their smartphone, participants were asked to complete the ESM questionnaires as soon as possible told the link would expire in 30 minutes. Participants were encouraged to respond to as many of the 35 total prompts as possible, and they were reimbursed 15–25 RMB depending on their compliance with the ESM protocol.
Baseline measures
Symptoms of depression Depressive symptoms were assessed using the Beck Depression Inventory-II (BDI-II; Beck et al., 1996). The BDI-II consists of 21 items. Each item has four response options that are scored from 0 to 3. Participants select the option that best describes their feelings. For instance: "I do not feel sad" (0); "I feel sad much of the time" (1); "I feel sad all the time" (2); "I am so sad or unhappy that I can't stand it" (3). Higher total scores indicate more severe depressive symptoms. The Chinese version of the BDI-II demonstrated good reliability and validity in a sample of college students (Yang et al., 2012). In this study, the Cronbach's alpha of BDI-II was .90.
Symptoms of anxiety Anxiety symptoms were measured using the State-Trait Anxiety Inventory-Trait Scale (STAI-T; Li & Qian, 1995; Spielberger, 1983). The STAI-T has 20 items, and each item is rated on a 4-point Likert scale from 1 (not at all) to 4 (very much). Higher scores indicate more severe anxiety symptoms. In this study, the Cronbach's alpha of STAI-T was .90.
ESM assessment
Event intensity The measure of event intensity was based on participants’ rating of how pleasant the event was (see Myin-Germeys et al., 2001). Participants were first asked to briefly describe the most important event that occurred since the last prompt, and then to rate its pleasantness from − 3 (very unpleasant) to 3 (very pleasant). Based on the pleasantness ratings, events were categorized as negative (rating < 0), neutral (rating 0), or positive (rating > 0), so that a lower pleasantness rating for negative events indicated a more intense negative event, while a higher pleasantness rating for positive events indicated a more intense positive event.
Emotion intensity Participants were asked "How do you feel right now?" to assess the intensity of their current emotional experience. Four items measured positive affect (PA; "happy," "relaxed," "enthusiastic," and "excited") and five items measured negative affect (NA; "anxious," "sad," "angry," "stressed," and "scared"). Each item was rated from 1 (not at all) to 5 (extremely). At each prompt, the mean rating on the four PA items was calculated as the indicator of PA intensity, and the mean rating of the five NA items was calculated as the indicator of NA intensity. Internal consistency coefficients for PA items were: within-person α = .77, ω = .80; between-person α = .91, ω = .92; for NA items were: within-person α = .78, ω = .79; between-person α = .94, ω = .94.
Decisions about ER The choice to attempt ER, the type of strategy chosen, and the decision to stop regulation or switch to a new strategy were assessed by the following ESM questionnaire items.
ER Identification "During the event, did you attempt to increase or decrease your emotions?" This item was scored as 0/1 (0 = No; 1 = Yes).
ER strategy use ER strategies were assessed using eight items (Hiekkaranta et al., 2021; Li et al., 2024): "I avoided the situation where the event occurred" (Avoidance), "I tried to change the situation" (Situation modification), "I thought of other ways to interpret the situation" (Reappraisal), "I engaged in activities to distract myself" (Distraction), "I have thought about it a lot" (Rumination), "I accepted that it happened" (Acceptance), "I tried not to show my emotions on the outside" (Expressive suppression), and "I talked about it with somebody" (Social sharing). Each item was rated from 1 (strongly disagree) to 7 (strongly agree). Internal consistency coefficients for these ER items were: within-person α = .57, ω = .62; between-person α = .84, ω = .87.
ER strategy switching "Did you switch strategies because the initial one was not working?" This item was scored as 0/1 (0 = No; 1 = Yes).
ER strategy stopping " Are you still trying to change your emotions?" This item was scored as 0/1 (0 = No; 1 = Yes).
Perceived ER success "I was able to regulate my emotions successfully." This item was scored as 0/1 (0 = No; 1 = Yes).
Data analysis
Data was prepared and analyzed in IBM SPSS Version 23 for Windows, and Mplus Version 7.4. Multilevel modeling was used to account for the multilevel nature of the data. Specifically, multilevel generalized linear mixed models (GLMM) were used because the outcome variables (i.e., ER switching and ER stopping) were binary. Only questionnaires in which a need for ER was identified—specifically, those with a score of 1 on the ER identification item—were included in the final analyses, as these questionnaires contained participants' responses regarding strategy switching, cessation, and success.
The situational factors of event intensity, emotion intensity and perceived regulation success, and the outcome measures of switching or stopping were level-1 variables. The individual factors of BDI-II and STAI-T scores, age, and gender were level-2 variables. First, four GLMMs were developed to assess the associations between the three situational factors and strategy switching and stopping respectively, with separate models for negative and positive events. Depressive and anxiety symptoms as individual factors were then added separately to the models to test their association with strategy switching and stopping. Age and gender (women = 0, men = 1) were entered into all the models as covariates. To control for possible between-person confounding, the level-1 continuous variables (i.e., event intensity and emotion intensity) were person-mean centered. The level 2 continuous variables (i.e., the BDI-II score, the STAI-T score and age) were grand mean centered (Brans et al., 2013).
Transparency and Openness
The full list of the ESM questionnaires is available at open science framework (https://osf.io/dqt9c/?view_only=cd98fbc03f3b46bc92205a9ac782a94c). We report how we determined our sample size, all inclusion and exclusion criteria, and all measures used in the study.