Table 1

Comparison of baseline characteristics of students in the intervention and control groups
Intervention Control
N = 770 (42.4%) N = 1,044 (57.6%)
N % μ SD* N % μ SD* p**
Age 735 16.8 1.0 998 16.9 1.0 0.03
Sex 0.002
  Male 630 81.8 908 87.0
  Female 140 18.2 136 13.0
Area of training 0.09
  BPW£ 472 62.3 681 65.6
  Catering industry 171 22.6 236 22.7
  Personal services 115 15.2 121 11.7
Smoking status 0.25
  Non-smoker 334 43.4 434 41.6
  Smoker 386 50.1 557 53.4
  Ex-smoker 50 6.5 53 5.1

£ BPW = building and public works.

*SD = standard deviation **p-value <0.05. Data are mean ± SD. BPW: building and public works.

Minary et al.

Minary et al. BMC Public Health 2013 13:149   doi:10.1186/1471-2458-13-149

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