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Table 1 Study participants

From: Screen-Time Weight-loss Intervention Targeting Children at Home (SWITCH): a randomized controlled trial

  Intervention Mean (SD) Control Mean (SD) Treatment difference at 24 weeks (Intervention - Control)
  Baseline (n = 127) 24 weeks (n = 117) Baseline (n = 124) 24 weeks (n = 113) Estimate (95% confidence interval) P-value
Demographics
Age (years) 11.2   11.3    
Gender:    
Male 72 (57%)   70 (56%)
Female 55 (43%)   54 (44%)
Ethnicity:      
Māori 16 (13%)   13 (11%)
Pacific 67 (53%)   66 (53%)
NZ/European 44 (34%)   44 (35%)
Refused to answer 0   1 (1%)
Total household income (before tax)
Under $20,000 14 (11%)   22 (18%)    
$20,001-$30,000 14 (11%)   21 (17%)
$30,001-$40,000 19 (15%)   17 (14%)
$40,001-$50,000 18 (14%)   14 (11%)
$50,001-$60,000 5 (4%)   9 (7%)
$60,001-$70,000 11 (9%)   4 (3%)
$70,001-$80,000 9 (7%)   7 (6%)
$80,001-$90,000 6 (5%)   6 (5%)
Over $90,000 19 (15%)   12 (10%)
Don’t know 9 (7%)   12 (10%)
Refused to answer 3 (3%)   0 (0%)
Anthropometrics
zBMI score 2.57 (0.8) 2.58 (0.86) 2.52 (0.93) 2.56 (0.94) -0.01 (-0.08, 0.05) 0.67
BMI (kg/m2) 26.51 (4.50) 26.63 (4.69) 26.62 (5.30) 26.75 (5.19) -0.01 (-0.36, 0.35) 0.97
Height (m) 1.53 (0.10) 1.57 (0.10) 1.54 (0.10) 1.57 (0.10)   
Weight (kg) 63.21 (15.92) 66.01 (16.64) 63.98 (18.50) 66.57 (18.36)   
Waist circumference (cm) 87.45 (14.39) 89.06 (13.30) 87.89 (14.79) 89.12 (13.75) -0.09 (-1.95, 1.77) 0.93
FFM (kg) 42.01 (9.23) 44.08 (8.94) 42.48 (10.11) 44.54 (0.47) 0.24 (-0.63, 1.11) 0.59
FM (kg) 21.20 (8.01) 21.85 (9.31) 21.05 (10.11) 21.24 (9.21) 0.08 (-0.97, 1.14) 0.88
Percentage body fat (%) 32.78 (6.06) 32.14 (6.76) 31.93 (9.92) 31.41 (6.93) -0.05 (-1.38, 1.27) 0.94
Sedentary behaviours Baseline (n = 127) 24 weeks (n = 110) Baseline (n = 124) 24 weeks (n = 105)   
Total sedentary time (min/day) 550 (136) 520 (130) 561 (136) 542 (140) -20 (-56, 17) 0.29
Screen-based sedentary time (min/day) 250 (162) 120 (147) 244 (145) 235 (156) -33 (-73, 7) 0.11
Non screen-based sedentary time (min/day) 299 (137) 321 (133) 317 (137) 307 (150) 13 (-26, 51) 0.51
Enjoyment of sedentary behaviour 3.69 (0.62) 3.61 (0.54) 3.80 (0.55) 3.78 (0.64) -0.12 (-0.26, 0.02) 0.09
Physical activities Baseline (n = 127) 24 weeks (n = 110) Baseline (n = 124) 24 weeks (n = 105)   
PA level (MET/day) 1.58 (0.26) 1.59 (0.25) 1.64 (0.34) 1.60 (0.32) 0.01 (-0.07, 0.09) 0.82
LPA (min/day) 109 (59) 129 (81) 114 (72) 138 (89) -9 (-33, 14) 0.43
MPA (min/day) 113 (96) 113 (94) 111 (104) 89 (94) 24 (-1, 50) 0.06
VPA (min/day) 31(45) 32 (48) 44 (62) 37 (52) -1 (-15, 12) 0.84
MVPA (min/day) 144 (100) 145 (100) 155 (110) 127 (109) 22 (-6, 51) 0.13
Locomotion 164 (103) 174 (101) 174 (119) 165 (108) 9 (-20, 38) 0.54
Sleep (min/day) 640 (85) 645 (95) 619 (85) 633 (99) 8 (-19, 34) 0.57
Enjoyment of physical activity 4.13 (0.52) 4.18 (0.57) 4.21 (0.58) 4.24 (0.59) 0 (-0.1, 0.1) 0.82
  1. LPA: light physical activity; MVPA: moderate-to-vigorous intensity physical activity; SD: standard deviation; VPA: vigorous physical activity. Linear regression models for intervention difference adjusting for: baseline outcome value, age (in years), sex, most identified ethnicity.
  2. Household income is in NZ$: As of June 2014, $NZ1 = $US0.85.