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Table 1 Description of all questions included in the mental health measures
| Questionnaire items | Response options (coding; distribution at T1, i.e., age 16) | Inclusion in |
|---|---|---|
| AS = Anxiety Symptoms | ||
| DS = Depressive Symptoms | ||
| FSS = Functional Somatic Symptoms | ||
| Have you have experienced any nervous problems in the past 12 months? | ||
| Restlessness | Ticked box (1*; 15.9 %) Unticked box (0*; 84.1 %) | AS |
| Concentration difficulties | Ticked box (1*; 15.9 %) Unticked box (0*; 84.1 %) | AS, DS |
| Worried or anxious | Ticked box (1*; 12.1 %) Unticked box (0*; 87.9 %) | AS |
| Palpitations or stomach problems | Ticked box (1*; 6.6 %) Unticked box (0*; 93.4 %) | AS, FSS |
| Anxiety or panic | Ticked box (1*; 4.0 %) Unticked box (0*; 96.0 %) | AS |
| How often have you experienced any nervous problems during the past 12 months? | Never (*1; 72.7 %), Off and on (*1; 25.9 %), Quite often (*2; 1.4 %), All the time (*2; 0 %) | |
| Does it happen that you feel dejected when you think about the future? | Almost never (0; 31.5 %), No, more seldom (1; 45.7 %), Yes, quite often (1; 20.3 %), Yes, very often (2; 2.5 %) | DS |
| How often have you felt sad or depressed during the last 12 months? | Never (0; 27.4 %), Off and on (1; 66.0 %), Quite often (1; 6.2 %), All the time (2; 0.4 %) | DS |
| Have you experienced sleeping problems during the last 12 months? | Never (0; 63.1 %), Off and on (1; 33.4 %), Quite often (1; 2.7 %), All the time (2; 0.9 %) | DS, FSS |
| Have you now (or have you during the past 12 months had) any of the following diseases or symptoms? | ||
| Poor appetite | No (0; 75.8 %), Yes, moderate (1; 22.2 %), Yes, severe (2; 2.0 %) | DS |
| Headache, migraine | No (0; 47.0 %), Yes, moderate (1; 48.1 %), Yes, severe (2; 5.0 %) | FSS |
| Other stomach ache (than heartburn, gastritis or gastric ulcer) | No (0; 66.3 %), Yes, moderate (1; 32.3 %), Yes, severe (2; 1.4 %) | FSS |
| Nausea | No (0; 53.8 %), Yes, moderate (1; 44.6 %), Yes, severe (2; 1.6 %) | FSS |
| Backache, hip ache or sciatica | No (0; 74.0 %), Yes, moderate (1; 23.5 %), Yes, severe (2; 2.5 %) | FSS |
| Tiredness/fatigue | No (0; 43.8 %), Yes, moderate (1; 50.2 %), Yes, severe (2; 6.0 %) | DS, FSS |
| Breathlessness | No (0; 81.9 %), Yes, moderate (1; 16.6 %), Yes, severe (2; 1.5 %) | FSS |
| Dizziness | No (0; 80.7 %), Yes, moderate (1; 18.2 %), Yes, severe (2; 1.1 %) | FSS |
| Overstrain | No (0; 84.8 %), Yes, moderate (1; 14.3 %), Yes, severe (2; 0.9 %) | FSS |
