Table 6 Outcome measures and breakdown of demographic variables across experimental conditions^a

% Children vaccinated in the school year (mean (SD))

61.57 (15.61)

61.94 (15.60)

63.53 (14.13)

62.87 (14.04)

62.47 (14.88)

2.68 (32990)

0.046

% Consent forms returned

73.55 (15.85)

75.67 (15.43)

76.18 (14.72)

75.97 (14.19)

75.34 (15.1)

4.84 (3, 2990)

0.002

% Consent given

64.92 (15.07)

65.46 (15.58)

66.96 (13.89)

66.32 (13.55)

65.91 (14.57)

2.91 (3, 2990)

0.033

% Consent refused

8.63 (7.33)

10.21 (8.70)

9.22 (8.13)

9.65 (7.71)

9.43 (8.00)

5.23 (32990)

0.001

Number of flu vaccine doses given in the school year (mean (SD))

27.75 (16.71)

27.98 (17.90)

27.95 (16.48)

28.21 (18.04)

27.97 (17.28)

0.09 (3, 2990)

0.967

Children eligible for flu vaccine in the school year (mean (SD))

45.86 (26.09)

45.22 (26.24)

45.22 (26.24)

45.41 (28.13)

45.59 (27.05)

0.11 (3, 2990)

0.953

Number of consent given

29.26 (17.28)

29.46 (18.66)

29.55 (17.26)

29.67 (18.78)

29.49 (18)

0.07 (3, 2990)

0.976

Number of consent refused

3.79 (3.68)

4.66 (4.84)

3.94 (3.70)

4.19 (3.86)

4.14 (4.06)

6.64 (3, 2990)

0.000

Number of consent returned

33.05 (19.17)

34.12 (21.45)

33.49 (19.33)

33.86 (21.14)

33.63 (20.29)

0.39 (3, 2990)

0.759

% Eligible for free school meals in the school (mean (SD))

12.18 (9.74)

11.18 (9.13)

12.48 (9.93)

12.33 (9.17)

12.04 (9.51)

2.88 (32990)

0.035

 % White

85.42

83.87

84. 18

84.69

84.54

0.98 (3, 2990)

0.402

 % Mixed

4.85

4.92

4.68

4.54

4.75

2.28 (3, 2990)

0.077

 % Asian

4.85

6.59

6.49

6.02

5.99

2.32 (3, 2990)

0.073

 % Black

3.01

2.92

2.86

2.83

2.84

0.14 (3, 2990)

0.939

 % Other

1.13

1.14

1.23

1.12

1.16

0.57 (3, 2990)

0.632

Religious denomination of the school (n (%))

57.41 (15)

< 0.001

 Catholic

56 (7.46)

52 (6.87)

77 (10.24)

24 (3.27)

209 (6.98)

 Church of England

229 (30.49)

222 (29.33)

205 (27.26)

239 (32.56)

895 (29.89)

 Other Christian Faith

0 (0)

0 (0)

0 (0)

3 (0.41)

3 (0.10)

 Sikh

0 (0)

0 (0)

3 (0.40)

0 (0)

3 (0.10)

 Other

0 (0)

0 (0)

3 (0.40)

0 (0)

3 (0.10)

 No religion

466 (62.05)

483 (63.80)

464 (61.70)

468 (63.76)

1881 (62.83)

Deprivation (n (%))

3.880 (3)

0.275

 High

83 (11.05)

88 (11.62)

102 (13.56)

77 (10.49)

350 (11.69)

 Low

668 (88.95)

669 (88.46)

650 (86.44)

657 (89.51)

2644 (88.31)

Urban/rural area (n (%))

13.226 (3)

0.004

 Urban

512 (68.18)

497 (65.65)

525 (69.81)

451 (61.44)

1985 (66.30)

 Rural

239 (31.82)

260 (34.35)

227 (30.19)

283 (38.56)

1009 (33.70)

School Year (n (%))

0.173 (6)

1.000

 1

252 (33.55)

251 (33.16)

251 (33.38)

243 (33.11)

997 (33.30)

 2

251 (33.42)

252 (33.29)

254 (33.78)

244 (33.24)

1001 (33.43)

 3

248 (33.02)

254 (33.55)

247 (32.85)

247 (33.65)

996 (33.27)