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Table 6 Multiple Cox regression of discontinuation occurring because of pregnancy

From: Efficacy of a combined contraceptive regimen consisting of condoms and emergency contraception pills

Variable Reference Group Comparative Group β SE Wald χ2 p RR RR(95%CI)
Husband age <30 30 ~ 34 -0.2078 0.0608 10.19 0.0014 0.812 0.921 ~ 0.915
   ≥35 -0.2681 0.0719 13.90 0.0002 0.765 0.409 ~ 0.881
Occupation Medical staff TST* 0.0987 0.1093 0.82 0.3665 1.100 0.891 ~ 1.367
   Official 0.1257 0.1124 1.25 0.2633 1.130 0.910 ~ 1.413
   Factory worker 0.2350 0.0942 6.23 0.0125 1.265 1.052 ~ 1.521
   Others** 0.2115 0.0994 4.53 0.0333 1.236 1.017 ~ 1.051
No. of contra. used    0.1569 0.0435 13.01 0.0003 1.170 1.074 ~ 1.274
  1. *TST-Teacher or scientific staff; **others: individual owner, service workers and shop employees.
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