Table 2 Sample size calculations

Time spent in MVPA per day^b

0.07

(0.00, 0.21)

5%

80%

0.25 SD

51 (1274)

Time spent sedentary per day^b

0.02

(0.00, 0.11)

5%

80%

0.25 SD

51 (1272)

Fruit and vegetable portions per day^c

0.04

(0.00, 0.09)

5%

85%

0.25 SD

51 (1268)

Secondary outcomes

Self-report time spent screen-viewing

0.00

(0.00, 0.03)

1%

90%

0.25 SD

40 (1000)

Snacks portions per day^c

0.03

(0.00, 0.07)

1%

90%

0.30 SD

50 (1254)

High fat food portions per day^c

0.05

(0.00, 0.10)

1%

85%

0.30 SD

51 (1274)

High energy drink portions per day^c

0.02

(0.00, 0.05)

1%

90%

0.30 SD

43 (1070)

Mean BMI

0.00

(0.00, 0.02)

1%

90%

0.30 SD

32 (794)

Mean Waist

0.05

(0.03, 0.20)

1%

80%

0.30 SD

51 (1274)

% overweight or obese (by BMI)

0.03

(0.01, 0.05)

1%

55%

20%^d

51 (1274)

% centrally obese (by Waist)

0.06

(0.02, 0.09)

1%

60%

20%^d

51 (1274)

% overweight or obese (by BMI)

0.03

(0.01, 0.05)

1%

80%

30%^e

51 (1274)

% centrally obese (by Waist)

0.06

(0.02, 0.09)

1%

82%

30%^e

51 (1274)