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Table 1 Baseline characteristics of the complete case sample separated by group (intervention and control; N = 1452) and comparison of completers vs. non-completers (N = 2001)

From: Efficacy of a prevention program for eating disorders in schools: a cluster-randomized controlled trial

Characteristic

Intervention

n = 724

Control

n = 728

p

Completer

n = 1452

Non-Completer

n = 549

p

Sex

  

.38

  

.005

 Female – n (%)

393 (54.3)

415 (57.0)

 

808 (55.6)

268 (48.8)

 

Agea - M (SE)

14.4 (0.30)

14.8 (0.35)

.45

14.6 (0.22)

14.9 (0.23)

.002

BMIa - M (SE)

19.8 (0.24)

20.0 (0.28)

.61

19.9 (0.17)

20.2 (0.19)

.003

Grade

  

.62

  

.55

 8th grade – n (%)

491 (67.8)

414 (56.9)

 

905 (62.3)

333 (60.7)

 

Migration backgrounda

  

.34

  

.25

 No migration background – n (%)

487 (68.1)

513 (72.1)

 

1000 (69.6)

347 (64.6)

 

 One parent – n (%)

118 (16.5)

86 (11.9)

 

204 (14.2)

86 (16.0)

 

 One parent and participant or both parents – n (%)

92 (12.9)

88 (12.2)

 

180 (12.5)

82 (15.3)

 

 Both parents and participant – n (%)

18 (2.5)

34 (4.7)

 

52 (3.6)

22 (4.1)

 

Parents educational levela

  

.87

  

.55

 Low both parents – n (%)

78 (15.8)

92 (18.2)

 

170 (17.0)

88 (23.6)

 

 High one parent – n (%)

94 (19.1)

124 (24.5)

 

218 (21.8)

79 (21.2)

 

 High both parents – n (%)

321 (65.1)

290 (57.3)

 

611 (61.2)

206 (55.2)

 
  1. Note: aVariable contains missing values. Percentages may be calculated using different denominators due to missing values. Non-completers are students who did not complete the follow-up assessments; completers are students who completed all follow-up assessments