Table 2

Univariate and multivariate analysis of condom use at first and last sexual intercourse among adolescents in Taiwan, 2012–2016

UnivariateMultivariate
Condom (1st sex)Condom (last sex)Condom (1st sex)Condom (last sex)
Yes (%)P valueYes (%)P valueAOR (95% CI)P valueAOR (95% CI)P value
Total706/1237 (57.07)-—332/1291 (25.72)
Gender0.31640.9545
 Male384/688 (55.81)186/725 (25.66)
 Female322/549 (58.65)146/566 (25.8)
School type<0.00010.0111NSNS
 Junior84/223 (37.67)49/248 (19.76)
 Senior80/117 (68.38)43/123 (34.96)
 Vocational173/283 (61.13)74/287 (25.78)
 Comprehensive235/374 (62.83)109/381 (28.61)
 Night134/240 (55.83)57/252 (22.62)
Sexual behaviours
 Age at 1st sex<0.0001<0.0001<0.00010.0019
  ≤11 years old7/64 (10.94)12/73 (16.44)ReferenceReference
  12–1353/144 (36.81)23/160 (14.38)4.74 (2.02 to 11.1)0.00040.86 (0.401 to 1.84)0.6968
  14–15233/412 (56.55)106/436 (24.31)10.6 (4.72 to 23.8)<0.00011.56 (0.807 to 3.02)0.1856
  ≥16405/585 (69.23)190/610 (31.15)18.3 (8.20 to 40.9)<0.00012.00 (1.05 to 3.83)0.0360
No of sexual partner0.0048<0.0001NS0.0023
  1374/606 (61.72)202/648 (31.17)1.60 (1.23 to 2.07)0.0005
  >1326/607 (53.71)130/639 (20.34)Reference
Substance use
 Current smoker0.00130.0009NSNS
  No412/671 (61.4)207/701 (29.53)
  Yes289/553 (52.26)123/576 (21.35)
 Heavy alcohol use0.00370.4314NS
  No587/995 (58.99)271/1038 (26.11)
  Yes (≥5 drinks/day)112/231 (48.48)57/241 (23.65)
  • Subjects who did not respond to the questions (ie, missing data) were not included in this table.

  • At first sex, the number of missing data in the following questions: age at first sex—32, no of sexual partner—24, current smoker—13, heavy alcohol use—11.

  • At last sex, the number of missing data in the following questions: age at first sex—12, no of sexual partner—4, current smoker—14, heavy alcohol use—12.

  • P values of univariate analysis were obtained by Χ2 test, while those of multivariate analysis were calculated by logistic regression with forward selection.

  • AOR, adjusted OR; NS, non-significant.