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Table 2 Comparison of socio-demographic characteristics between lost subjects and the others participants

From: Early markers of airways inflammation and occupational asthma: Rationale, study design and follow-up rates among bakery, pastry and hairdressing apprentices

  Subjects lost Other participants p
Size, n (%) 90 (20.4%) 351 (79.6%)  
Age, mean (SD; in years) 17,0 (1.4) 16,9 (1.4) 0.33
Sex    0.16
   Male, n (%) 57 (63.3%) 194 (55.3%)  
   Female, n (%) 33 (36.7%) 157 (44.7%)  
Apprentices    0.16
   Bakers, n (%) 39 (44.3%) 122 (34.8%)  
   Pastry-makers, n (%) 24 (26.7%) 87 (24.8%)  
   Hairdressers, n (%) 27 (30.0%) 142 (40.4%)  
Atopic status    0.27
   Atopy, n (%) 45 (50.0%) 198 (56.4%)  
   Non atopy, n (%) 45 (50.0%) 153 (43.6%)  
Active cigarette smoking    0.005
   Smokers, n (%) 52 (57.8%) 145 (41.3%)  
   Non-smokers, n (%) 38 (42.2%) 206 (58.7%)