Table 1

Univariate analysis on the associations between demographic characteristics and the risk of adolescent current smoking

CharacteristicsSmokers (N=1549; %)Non-smokers (N=17 993; %)OR95% CI
Age range (years)
 ≤13107 (2.74)3797 (97.26)Ref.
 14–144 (4.74)2894 (95.26)1.771.37 to 2.28
 15–276 (8.36)3026 (91.64)3.242.58 to 4.07
 ≥161022 (10.99)8276 (89.01)4.383.58 to 5.37
Gender
 Girls242 (2.46)9577 (97.54)Ref.
 Boys1307 (13.44)8416 (86.56)6.155.34 to 7.07
Location of school
 Urban488 (6.64)6858 (93.36)Ref.
 Rural1061 (8.70)11 135 (91.30)1.341.20 to 1.50
Father's education level
 <Middle school graduate382 (8.87)3926 (91.13)Ref.
 Middle school graduate723 (8.46)7827 (91.54)0.950.83 to 1.08
 >Middle school graduate444 (7.07)6240 (92.93)0.730.63 to 0.84
Mother's education level
 <Middle school graduate531 (8.77)5522 (91.23)Ref.
 Middle school graduate665 (8.28)7365 (91.72)0.940.83 to 1.06
 >Middle school graduate353 (6.47)5106 (93.53)0.720.63 to 0.83
Only child
 Yes850 (8.25)9450 (91.75)Ref.
 No699 (7.56)8543 (92.44)0.910.82 to 1.01
School level
 Middle school442 (4.60)9175 (95.40)Ref.
 Academic high school355 (6.46)5140 (93.54)1.431.24 to 1.66
 Vocational high school752 (16.98)3678 (83.02)4.243.75 to 4.80
Parental marriage status
 Married1377 (7.79)16 303 (92.21)Ref.
 Divorced/widowed/separated172 (9.24)1690 (90.76)1.211.02 to 1.42