Table 1

Descriptive characteristics of cases and controls
Characteristic Cases (N = 31) Controls (N = 196) Total (N = 227) p Test usedΩ
Women % 8 (25.8%) 94 (48.0%) 102 (44.9%) 0.02 Chi2
Age (years) Mean [SD] 26.1 [2.5] 25.1 [3.0] 25.2 [2.9] 0.06 T
Height (cm) Mean [SD] 173.4 [8.0] 170.1 [9.2] 170.5 [9.1] 0.06 T
Weight (kg) Mean [SD] 77.5 [15.5] 70.2 [14.1] 71.2 [14.5] 0.009 T
Tobacco smoking (at visit):
   Never smokers % 10 (32.2%) 76 (38.8%) 86 (37.9%)
   Ex smokers % 7 (22.6%) 26 (13.3%) 33 (14.5%) 0.38 Chi2
   Current smokers % 14 (45.2%) 94 (48.0%) 108 (47.6%)
Occupation:
   Hairdressers % 7 (22.6%) 85 (43.4%) 92 (40.5%) 0.03 Chi2
   Exposure duration (years) Mean [SD] 6.1 [3.1] 6.7 [2.2] 6.6 [2.4] 0.25 KW
   Sector dropout % 10 (32.3%) 22 (11.2%) 32 (14.1%) 0.004 F

Ω Chi2 = chi-square test – T = Student test – KW = Kruskal-Wallis test – Fisher = fisher test.

† From the sector in which the subjects graduated.

Rémen et al.

Rémen et al. BMC Public Health 2012 12:387   doi:10.1186/1471-2458-12-387

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