Table 1 Baseline characteristics of children and schools participating in The Daily Mile study overall and by trial arm.

From: Effectiveness and cost-effectiveness of The Daily Mile on childhood weight outcomes and wellbeing: a cluster randomised controlled trial

Characteristics

Intervention arm

Control arm

Total

Demographic

n = 1153

n = 1127

n = 2280

Sex:

   

Female

549 (47.6)

534 (47.5)

1083 (47.5)

Male

604 (52.4)

591 (52.5)

1195 (52.5)

Not knownc

0

2

2

Mean (SD) age (years)

8.8 (1.1)

8.8 (1.0)

8.9 (1.0)

Ethnicity:

   

White British

614 (53.3)

559 (50.0)

1173 (51.5)

South Asian

186 (16.2)

183 (16.3)

369 (16.2)

Black African Caribbean

88 (7.6)

103 (9.2)

191 (8.4)

Other/not specified

264 (22.9)

279 (24.8)

543 (23.9)

Not knownc

1

3

4

Deprivation fiftha:

   

1 (most deprived)

575 (49.9)

621 (55.1)

1196 (52.5)

2

459 (39.8)

169 (15.0)

628 (27.5)

3

59 (5.1)

222 (19.7)

281 (12.3)

4

60 (5.2)

58 (5.2)

118 (5.2)

5 (least deprived)

0 (0.0)

57 (5.1)

57 (2.5)

Anthropometric

   

BMI z score:

n = 1077

n = 1028

n = 2105

Mean (SD) BMI z score

0.37 (1.2)

0.38 (1.2)

0.38 (1.3)

Body fat %:

n = 1075

n = 1027

n = 2102

Mean (SD)

21.9 (7.1)

21.8 (6.9)

21.8 (7.0)

Weight statusb:

n = 1077

n = 1028

n = 2105

Underweight (≤2nd centile)

16 (1.5)

27 (2.6)

43 (2.0)

Healthy weight (>2nd centile and <85th centiles)

728 (67.6)

684 (66.5)

1412 (67.1)

Overweight (≥85th centile and <95th centiles)

211 (19.6)

197 (19.2)

408 (19.4)

Obese (≥95th centile)

122 (11.3)

120 (11.7)

242 (11.5)

Not knownc

76

99

175

Physical activity

   

Linear track test (m):

n = 702

n = 639

n = 1341

Mean (SD)

351 (105)

346 (81)

348 (95)

Quality of life and Wellbeing

   

CHU-9D utility score:

n = 801

n = 751

n = 1552

Mean (SD)

0.83 (0.22)

0.84 (0.16)

0.84 (0.16)

Middle Years Instrument Wellbeing sum score:

n = 801

n = 751

n = 1552

Mean (SD)

58.5 (10.9)

57.8 (11.0)

58.2 (11.0)

Academic attainmentd

   

Maths:

n = 628

n = 631

n = 1259

Mean (SD)

2.4 (1.2)

2.5 (1.1)

2.5 (1.2)

Reading:

n = 629

n = 629

n = 1258

Mean (SD)

2.5 (1.2)

2.5 (1.2)

2.5 (1.2)

Writing:

n = 629

n = 634

n = 1263

Mean (SD)

2.2 (1.1)

2.3 (1.2)

2.3 (1.1)

Overall academic attainment score:

n = 626

n = 625

n = 1251

Mean (SD)

7.1 (3.2)

7.3 (3.2)

7.2 (3.2)

  1. aIndex of multiple deprivation, 2015
  2. bBased on UK 1990 reference centile curves and applying cut-offs used for population monitoring
  3. cNot included in denominator for calculation of percentages
  4. dMeasured on a 5-point scale according to age-related expectations. Overall academic score is the sum of the ratings for math, reading and writing
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