Table 5.

Baseline predictors of pregnancy in Cox regression models

Variable	Univariable		Multivariable
	HR (95% CI)	p-value	HR (95% CI)	p-value
Site
Vulindlela	Ref		Ref
eThekwini	1.33(0.76-2.34)	0.32	1.9(0.97-4.03)	0.06
Age groups
18-24	Ref		Ref
25-29	1.19(0.62-2.31)	0.60	0.86(0.43-1.72)	0.66
30-34	1.61(0.74-3.48)	0.23	0.85(0.34-2.12)	0.73
35+	N/A
Type of contraception
DMPA	Ref		Ref
NET-EN	1.01(0.29-3.59)	0.98	0.86(0.24-3.11)	0.81
Oral	14.51(7.58-27.78)	<0.000 1	15.91(8.03-31.52)	<0.0001
Marital status
Other	Ref		Ref
Married	1.1(0.07-17.52)	0.95	1.54(0.09-25.97)	0.77
Stable	3.57(0.49-25.87)	0.20	3.59(0.47-27.62)	0.22
Education
Primary school	Ref		Ref
High school	2.45(0.34-17.74)	0.38	0.78(0.11-5.83)	0.81
Tertiary	5.31(0.65-43.18)	0.12	0.76(0.08-6.92)	0.81
Number of previous live births
Previous live births (per 1 live birth increase)	0.71 (0.51-0.995)	0.0466	0.95(0.65-1.40)	0.81
Sex acts in last 30 days
Sex acts in last 30 days (per 1 act increase)	1.0 (0.98-1.03)	0.73	1.01 (0.98-1.05)	0.53
Condom use in last 30 days
Always	Ref		Ref
Inconsistent	1.29 (0.69-2.42)	0.42	2.05 (1.04-4.04)	0.04

HR = hazard ratio; CI = confidence interval

N/A = not applicable

Ref = reference statistic