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Table 5 Diary and accelerometer-based primary indicators of effectiveness at baseline (B) and 4 weeks after the intervention (F1) in the intervention (INT) and comparison (COM) group and the differences in change between the groups from B to F1 with 95% confidence intervals (95% CI)

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 COM Between-group difference in change (95% CI)a)
B F1 B F1
Accelerometer, n 187 122 170 118 INT = 117; COM = 107
Total PA, mean (SD)
• Minutes per day 267.1 (53.3) 239.3 (49.7) 256.5 (59.8) 239.2 (60.6) −8.2 (− 19.3 to 2.8)
• Light-intensity minutes per day 180.9 (34.3) 165.7 (30.7) 176.8 (39.8) 168.8 (38.4) −6.3 (−14.0 to 1.3)
• Moderate-to-vigorous intensity minutes per day 86.7 (32.3) 73.6 (28.0) 79.7 (30.2) 70.4 (31.4) −1.1 (−6.9 to 4.8)
• Steps per day 10,238 (3098) 9292 (2704) 9919 (2902) 9141 (3200) 50 (− 813 to 713)
• Breaks from sittingb) 39.4 (8.4) 37.6 (7.6) 38.0 (9.1) 37.0 (8.8) −0.1 (−1.7 to 1.4)
• Meeting PA recommendationsc), n (%) 25 (13.4) 17 (13.9) 22 (12.9) 17 (14.4) −0.2 (−4.5 to 4.0)
Activity diary, n 209 89 199 65 INT = 88; COM = 65
Walking or cycling to school, mean (SD)
• Minutes per day 7.9 (6.2) 7.7 (6.8) 8.5 (6.2) 8.1 (6.4) 0.7 (−1.3 to 2.7)
• Weekly number of days 3.8 (1.9) 3.3 (2.1) 3.8 (1.8) 3.5 (2.0) −0.1 (−0.5 to 0.4)
Walking or cycling from school, mean (SD)
• Minutes per day 9.0 (6.5) 8.3 (7.4) 9.8 (7.2) 9.5 (7.2) 0.5 (−1.9 to 2.9)
• Weekly number of days 3.8 (1.7) 3.3 (2.0) 3.8 (1.7) 3.5 (2.0) −0.1 (−0.7 to 0.6)
PA during school hours, mean (SD)
• Total minutes per day 39.7 (23.7) 36.0 (22.9) 33.6 (21.7) 28.6 (17.1) 6.4 (−6.1 to 19.0)
• Minutes per day during recesses 5.5 (9.5) 4.3 (10.5) 9.0 (13.4) 7.9 (11.0) −0.5 (−3.3 to 2.4)
SB during school hours, mean (SD)
• Total minutes per day 249.2 (69.9) 260.0 (78.4) 251.9 (78.9) 277.0 (72.7) −12.4 (−44.4 to 19.6)
Participation in organized sports, mean (SD)
• Weekly minutes 240.7 (263.4) 267.8 (274.8) 221.9 (281.9) 200.8 (278.9) 5.1 (−58.0 to 68.2)
  1. a)Linear mixed models adjusted for age, sex and baseline value; teacher as random effect. Dichotomous variables were analyzed without adjustments and random effect correction but statistical levels were re-checked with generalized linear mixed models with same adjustments and random effect correction as used in non-dichotomous variables
  2. b)Number of SB periods ending with standing up
  3. c)At least 1 hour of moderate-to-vigorous intensity PA on all valid days