The Adjustment Disorder New Module-8 Child and Adolescent Version (ADNM-8-CA) will be used to measure exposure to stressors in the past month and ICD-11 symptoms of adjustment disorder [1 , 20 (link)]. The ADNM-8-CA stressors list includes 16 potentially stressful events relevant to adolescents (e.g. parents’ divorce, difficulties in school, the end of the friendship). Participants are asked to provide binary answers No or Yes if they have experienced any of the listed stressors over the last 12 months. The assessment of adjustment disorder symptoms includes eight symptom items. The ADNM-8-CA measures two ICD-11 adjustment disorder symptoms: (1) preoccupation with the stressor (4 items) and (2) failure to adapt (4 items). A 4-point Likert scale, ranging from Never (= 1) to Often (= 4) is used to evaluate the frequency of the listed symptoms. The total score of the ADNM-8-CA range from 1 to 32. A higher total score which is a sum of all the ADNM-8-CA symptom items, indicates higher adjustment problems, and a score ≥ 23 indicates probable adjustment disorder. The ADNM-8-CA was previously used in a large Lithuanian adolescent sample, and good psychometric properties have been reported [1 ].
The Generalized Anxiety Disorder-7 (GAD-7) [21 ] will be used to measure generalized anxiety symptoms that bothered participants during the past 2 weeks. The GAD-7 comprises 7 items with the possible answers ranging on a 4-point Likert scale from Not at all (= 0) to Nearly every day (= 3). The total score of the GAD-7 range from 0 to 21, with higher scores indicating higher generalized anxiety problems. The GAD-7 is applicable to adolescents from 12 years old. However, GAD-7 has not previously been used in a sample of Lithuanian adolescents. Nevertheless, the GAD-7 showed good psychometric properties in adult samples in Lithuania [22 , 23 ].
The Patient Health Questionnaire-9 (PHQ-9) [24 (link)] will be used to measure depressive symptoms that bothered participants during the past 2 weeks. The PHQ-9 comprises nine items, with the answers ranging from Not at all (= 0) to Nearly every day (= 3) on a 4-point Likert scale. The total score of the PHQ-9 may range from 0 to 27, with higher scores indicating higher depressive symptoms. The PHQ-9 is suitable for adolescents from 13 years old. The PHQ-9 has not been used in a sample of Lithuanian adolescents previously. The PHQ-9, used in adult samples in Lithuania, showed good psychometric properties [22 , 23 ].
The WHO-5 Well-being Index (WHO-5) [25 (link)] will be used to measure general psychological well-being. The WHO-5 comprises five items measuring how an individual felt over the past 2 weeks with a Likert scale ranging At no time (= 0) to All of the time (= 5). The total score of the WHO-5 is the sum of all items multiplied by 4, and may range from 0 to 100, with a bigger score indicating higher well-being. The WHO-5 is suitable for children aged 9 and above. In Lithuanian adult samples, the WHO-5 has good psychometric properties [22 , 23 ].
The Perceived Positive Social Support Scale (PPSS) [26 ] is a revised version of the Crisis Support Scale [27 (link)] measuring social support. The PPSS comprises four items, covering how the participant feels with family and friends (e.g., how often someone tends to listen when the participant wants to talk). Participants are asked to provide a response to each item on an 8-point Likert scale ranging from Never (= 0) to Always (= 7). The total score of PPSS may range from 0 to 28, with higher scores indicating higher perceived positive social support. The PPSS has been used previously in the adolescent sample in Lithuania and showed good psychometric properties [26 ].
The Generalized Anxiety Disorder-7 (GAD-7) [21 ] will be used to measure generalized anxiety symptoms that bothered participants during the past 2 weeks. The GAD-7 comprises 7 items with the possible answers ranging on a 4-point Likert scale from Not at all (= 0) to Nearly every day (= 3). The total score of the GAD-7 range from 0 to 21, with higher scores indicating higher generalized anxiety problems. The GAD-7 is applicable to adolescents from 12 years old. However, GAD-7 has not previously been used in a sample of Lithuanian adolescents. Nevertheless, the GAD-7 showed good psychometric properties in adult samples in Lithuania [22 , 23 ].
The Patient Health Questionnaire-9 (PHQ-9) [24 (link)] will be used to measure depressive symptoms that bothered participants during the past 2 weeks. The PHQ-9 comprises nine items, with the answers ranging from Not at all (= 0) to Nearly every day (= 3) on a 4-point Likert scale. The total score of the PHQ-9 may range from 0 to 27, with higher scores indicating higher depressive symptoms. The PHQ-9 is suitable for adolescents from 13 years old. The PHQ-9 has not been used in a sample of Lithuanian adolescents previously. The PHQ-9, used in adult samples in Lithuania, showed good psychometric properties [22 , 23 ].
The WHO-5 Well-being Index (WHO-5) [25 (link)] will be used to measure general psychological well-being. The WHO-5 comprises five items measuring how an individual felt over the past 2 weeks with a Likert scale ranging At no time (= 0) to All of the time (= 5). The total score of the WHO-5 is the sum of all items multiplied by 4, and may range from 0 to 100, with a bigger score indicating higher well-being. The WHO-5 is suitable for children aged 9 and above. In Lithuanian adult samples, the WHO-5 has good psychometric properties [22 , 23 ].
The Perceived Positive Social Support Scale (PPSS) [26 ] is a revised version of the Crisis Support Scale [27 (link)] measuring social support. The PPSS comprises four items, covering how the participant feels with family and friends (e.g., how often someone tends to listen when the participant wants to talk). Participants are asked to provide a response to each item on an 8-point Likert scale ranging from Never (= 0) to Always (= 7). The total score of PPSS may range from 0 to 28, with higher scores indicating higher perceived positive social support. The PPSS has been used previously in the adolescent sample in Lithuania and showed good psychometric properties [26 ].
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