Table 2

Socio-economic and demographic characteristics of study participants
Total (N=2688) Males (N=1324) Females (N=1329) t/χ2
Age (years, mean±SD) 17.17±0.72 17.20±0.74 17.14±0.70 1.81 a
Family income (%) 0.94 b
 Low (<1500) 15.9 15.2 16.4
 Medium (1500–2499) 33.3 33.2 33.6
 High (≥2500) 50.8 51.6 50.0
Family structure 7.73b
 Single parent family 7.8 8.1 7.2
 Nuclear family 66.0 63.7 68.5
 Large family 26.2 28.1 24.2
Father’s education level (%) 10.83** b
 Middle school and below 7.6 8.5 6.9
 High school 45.6 42.4 48.7
 College and above 46.8 49.2 44.5
Mother’s education level (%) 7.08* b
 Middle school and below 9.4 9.3 9.6
 High school 50.8 48.4 53.1
 College and above 39.9 42.3 37.3

Family income was expressed in RMB(yuan)/person/month.

a Independent-samples t test.

b K*2 Chi-square Test.

* P<0.05.

** P<0.01.

Li et al.

Li et al. BMC Public Health 2013 13:295   doi:10.1186/1471-2458-13-295

Open Data