Table 3

Multivariate analysis on the associations between related factors and the risk of adolescent current smoking

FactorsSmokers (N=1549; %)Non-smokers (N=17 993; %)OR*95% CI
Age range (years)
 ≤13107 (2.74)3797 (97.26)Ref.
 14–144 (4.74)2894 (95.26)1.691.30 to 2.19
 15–276 (8.36)3026 (91.64)2.501.95 to 3.20
 ≥161022 (10.99)8276 (89.01)2.541.88 to 3.44
Gender
 Girls242 (2.46)9577 (97.54)Ref.
 Boys1307 (13.44)8416 (86.56)6.855.92 to 7.92
Location of school
 Urban488 (6.64)6858 (93.36)Ref.
 Rural1061 (8.70)11 135 (91.30)1.241.10 to 1.41
School level
 Middle school442 (4.60)9175 (95.40)Ref.
 Academic high school355 (6.46)5140 (93.54)0.990.77 to 1.26
 Vocational high school752 (16.98)3678 (83.02)3.142.49 to 3.98
Parental marriage status
 Married1377 (7.79)16 303 (92.21)Ref.
 Divorced/widowed/separated172 (9.24)1690 (90.76)1.331.11 to 1.59
Parents smoking
 No433 (6.08)6688 (93.92)Ref.
 One parent1082 (8.88)11 104 (91.12)1.241.09 to 1.40
 Both34 (14.47)201 (85.53)2.051.33 to 3.15
Belief that smoking is harmful
 No57 (22.27)199 (77.73)Ref.
 Yes1492 (7.74)17 794 (92.26)0.310.22 to 0.44
Secondhand smoke exposure
 No499 (5.12)9242 (94.88)Ref.
 Yes1050 (10.71)8751 (89.29)2.051.82 to 2.31
School performance
 Below average759 (14.25)4568 (85.75)Ref.
 Average617 (6.28)9206 (93.72)0.440.39 to 0.50
 Excellent173 (3.94)4219 (96.06)0.280.24 to 0.34
Living with family
 No990 (9.39)9555 (90.61)Ref.
 Yes559 (6.21)8438 (93.79)0.780.69 to 0.88
  • *ORs were adjusted for all significant variables listed in tables 1 and 2.