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Table 2 Descriptive Statistics of Study measures, by gender and overall

From: Screen-based media use clusters are related to other activity behaviours and health indicators in adolescents

  Males (n = 293) Females (n = 350) Overall (n = 643)
Age (yrs: mean, SD) 14.0 (0.2) 14.0 (0.2) 14.0 (0.2)
SBM activity (h/wk: median, IQR)    
Computer use:    
General computer use 0 (2.2) 0.5 (2.3) 0.2 (2.2)
Email 0 (0) 0 (0.7) 0 (0)
Computer-graphics 0 (0) 0 (0) 0 (0)
Internet 0 (1.1) 0 (1.2) 0 (1.2)
Word processing 0 (0) 0 (0) 0 (0)
Computer games 1.0 (5.9) 0 (1.8) 0 (3.6)
Non-computer games 0.7 (4.5) 0 (0) 0 (1.3)
TV 17.4 (13.9) 14.3 (12.2) 15.7 (13.8)
Total SBM activity^ 30.1 (19.5) 21.2 (13.3) 24.8 (16.8)
Other activities    
Reading (h/wk: median, IQR) 1.2 (3.0) 1.6 (3.1) 1.4 (3.1)
Phone use (h/wk: median, IQR) 0 (0.2) 0.3 (1.3) 0 (0.9)
Pedometer count (steps/wk: mean, SD) 78,854 (28,452) 68,435 (23,127) 73,149 (26,169)
Moderate/Vigorous activity (h/wk: mean, SD) 15.7 (8.4) 13.1 (6.9) 14.3 (7.7)
Physical measures    
Body mass index (mean, SD) 20.6 (3.7) 21.4 (4.2) 21.0 (4.0)
Back muscle endurance (secs: mean, SD) 87.0 (61.3) 90.0 (65.3) 88.5 (63.5)
Sitting trunk angle (deg: mean, SD) 238.0 (11.8) 225.6 (10.3) 231.4 (12.6)
Spinal pain    
Neck pain sitting (%) 14/291 (4.8%) 31/348 (8.9%) 45/639 (7.0%)
Back pain sitting (%) 31/291 (10.7%) 62/350 (17.7%) 93/641 (17.7%)
Psychosocial measures    
Self-efficacy1 (mean, SD) 3.4 (0.6) 3.3 (0.6) 3.4 (0.6)
Depression2 (median, IQR) 3.0 (7.0) 5.0 (8.0) 4.0 (7.0)
Internalising behaviour3 (mean, SD) 9.0 (6.1) 10.2 (6.5) 9.7 (6.4)
Externalising behaviour3 (mean, SD) 10.1 (6.1) 10.3 (6.2) 10.2 (6.2)
Socioeconomic Status based on CD4 (mean, SD) 1042 (91) 1036 (91) 1038 (91)
  1. ^ sum of computer, non-computer game and TV.
  2. 1Cowen’s Perceived Self-Efficacy Scale, possible score ranges from 1–5, higher scores indicate greater self-efficacy.
  3. 2Beck’s Depression Inventory, possible score ranges from 0 to 60, higher scores indicate more depressed mood.
  4. 3Youth Self-Report version of Child Behaviour Checklist, Internalising range 0–62, Externalising 0–60, higher scores indicate more behavioural problems.
  5. 4Advantage/Disadvantage (IAD) from Socio Economic Index for Areas (SEIFA) based on postcode, standardised to population mean of 1,000 with SD of 100.