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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.