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Table 1 Participant characteristics for study sample (mean and SD unless otherwise stated)

From: Self-reported sleep quality, weight status and depression in young adult twins and siblings

  N (%) Mean (SD)
Age (years) - 20.36 (1.78)
Sex (n;%)
 Male 528 (38) -
 Female 864 (62) -
Education   
 Up to GCSE or GNVQ 225 (16.3) -
 AS-level or A-level 702 (50.9) -
 Above A-level 453 (32.8) -
Smoking
 Yes 278 (20) -
 Given up 135 (10) -
 Never 977 (70) -
Alcohol intake
 Up to twice a month 436 (32.9) -
 Once or twice a week 621 (46.8) -
  More than twice a week 269 (20.3) -
Weight status
 Underweight (BMI: 16–18.5) 123 (8.8) -
 Healthy weight (BMI: 18.5–29.9) 1000 (71.8) -
 Overweight (BMI: 25–29.9) 200 (14.4) -
 Obese (BMI: 30–39.9) 69 (5.0) -
Sleep qualitya* - 5.71 (3.01)
Depressionb* - 6.43 (5.71)
Anixetyc* - 25.05 (14.74)
General healthd* - 2.33 (0.97)
  1. aSleep quality was assessed using the sum score from the Pittsburgh Sleep Quality Index. [38] bDepression symptoms were measured using the Short Moods and Feelings Questionnaire.[26] cAnxiety symptoms were measured using the Revised Symptoms of Anxiety Scale.[7] dGeneral health was measured using a single, self-report item. *Higher scores for sleep quality, depression, anxiety and general health indicate poorer sleep quality, greater number of depression symptoms, greater number of anxiety symptoms and poorer health, respectively