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Table 2 Background characteristics of the students responding to the baseline questionnaire in the intervention (INT) and comparison (COM) group. Means and standard deviations (SD) or numbers (n) and proportions (%)

From: Kids Out; evaluation of a brief multimodal cluster randomized intervention integrated in health education lessons to increase physical activity and reduce sedentary behavior among eighth graders

  INT (n = 651) COM (n = 825)
Age (years), mean (SD) 13.9 (0.5) 13.9 (0.5)
Girls, n (%) 314 (48.2) 391 (47.4)
Body mass indexa), mean (SD) 19.8 (2.7) 19.8 (2.8)
• >  25 kg/m2, n (%) 62 (12.5) 80 (12.5)
Self-rated fitness, n (%)
• Better than peers 198 (35.6) 242 (32.8)
• Equal to peers 235 (42.3) 322 (43.8)
• Worse than peers 123 (22.1) 172 (23.4)
Distance from home to school, mean (SD) 4.5 (5.5) 4.2 (4.8)
• < 1 km, n (%) 68 (12.5) 116 (15.8)
• 1–3 km 287 (52.7) 328 (44.8)
• > 3 ≤ 5 km 53 (9.7) 93 (12.7)
• >  5 km 137 (25.1) 195 (26.6)
Main residency, n (%)
• Apartment house 171 (30.5) 235 (31.7)
• Detached house 209 (37.3) 286 (38.5)
• Row house or semi-detached house 153 (27.3) 184 (24.8)
• Combination of two from the residence types above 22 (3.9) 26 (3.5)
• Other 5 (0.9) 11 (1.5)
Family circumstances, n (%) 22 (3.9) 26 (3.5)
• Living with both parents or in a blended family 393 (70.2) 490 (65.9)
• Living with a single parent (permanently or rotating between parents) 163 (29.2) 244 (32.8)
• Living with another person 4 (0.7) 8 (1.1)
Having a car in the family, n (%) 513 (91.6) 675 (91.5)
• Number of cars, mean (SD) 1.5 (0.9) 1.5 (0.8)
Having a moped, scooter or microcar, n (%) 54 (9.7) 67 (9.1)
Having a rideable bicycle, n (%) 510 (91.6) 675 (91.3)
  1. a)BMI-for-age [39]