Savannah Boele

3 Transactional processes between support and depressive symptoms 85 Measures Parental Support One item assessed daily parental support: “My parents were warm and supportive today.” This item was included in the last evening ESM questionnaire. The item was responded on a scale from 1 (not) to 7 (very). Earlier work demonstrated convergent validity for this 1-item scale (L. H. C. Janssen, Elzinga et al., 2021). In this study, the average score of the 1-item parental support scale correlated moderately-to-strongly with the 5-item Parental Support scale of the Network Relationship Inventory (NRI; Furman & Buhrmester, 1985), assessed at T0 (r = .45, p < .001). On average, adolescents reported on 4.0 out of the 7 days on their parental report (972 observations in total). Negative Affect Six items assessed negative affect (i.e., sad, unhappy, disappointed, angry, nervous, irritability), with a response scale ranging from 1 (not) to 7 (very). These items were ESM measures (e.g., “I feel sad”) and asked eight times a day for seven consecutive days. We calculated the daily average of the negative affect items, which showed good internal consistency across the 7 days (α range = .88-.93). The average score of negative affect correlated moderately to strongly with the Child Depression Inventory II (CDI-II; Timbremont et al., 2008), which was assessed at T0 (r = .59, p < .001). In total, we had 1,361 daily negative affect scores, which were based on 6,267 ESM assessments. Thus, on average, we had 5.6 daily negative affect scores per adolescent. Neuroticism Neuroticism was measured once at T0 with a subscale of the Ten Item Personality Inventory (TIPI; Gosling et al., 2003) that consists of two items: “I see myself as someone who is: 1) nervous and 2) calm/relaxed”. The items were rated on a 7-point scale from 1 (not at all true/very true) to 7 (very true/not at all true). A higher mean score indicated a higher level of neuroticism. The two items correlated moderately (r = .35, p < .001). METHOD DATASET 2 (BI-WEEKLY) Participants Adolescents (N = 259) participated in a preregistered study called “One size does not fit all” (http://osf.io/e2jzk). Data were used of the first 15 bi-weekly measurement waves

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