Table 3.

Factors Associated With Chlamydia trachomatis Among Women Aged 16–44 Years in Guangdong, China

	Univariate Analysis		Multivariable Analysis
Variables	Crude PR	95% CI	Adjusted PR	95% CI
Obstetrics clinics
Age at first sex
≥25 y	Ref.	-	Ref.	-
<25 y	2.14	(0.95–5.75)	2.94*	(1.15–9.11)
Previous PID	0.81	(0.04–4.16)	0.85	(0.05–4.40)
Ever engaged in smoking	2.82	(1.91–11.37)	2.77	(0.41–11.47)
Ever engaged in alcohol use	1.36	(0.50–3.15)	1.35	0.49–3.16
Gravidity
0	Ref.	-	Ref.	-
≥1	1.88	0.94–4.11	2.34*	1.06–5.61
Gynecology clinics
Age at first sex
≥25 y	Ref.	-	Ref.	-
<25 y	2.74*	(1.08–9.27)	2.08	0.78–7.27
No. of partners in past 12 mo
1	Ref.	-	Ref.	-
≥2	1.93***	(1.30–2.84)	1.85**	(1.23–2.75)
Previous PID	1.26	(0.51–3.14)	1.43	0.58–3.75
Previous CT	5.80	(0.27–61.66)	6.51	(0.22–199.69)
Ever engaged in smoking	2.25	(0.76–5.38)	1.83	(0.60–4.45)
Ever engaged in alcohol use	1.64***	(1.15–2.34)	1.28	0.86–1.91
Gravidity
0	Ref.	-	Ref.	-
≥1	1.04	(0.61–2.15)	2.04	(0.94–5.04)
Infertility clinics
Age at first sex
≥25 y	Ref.	-	Ref.	-
<25 y	7.17	(1.45–129.7)	7.48*	(1.45–137.37)
No. of partners in past 12 mo
1	Ref.	-	Ref.	-
≥2	1.05	(0.39–2.12)	1.21	(0.43–2.63)
Previous PID	0.43	(0.07–1.55)	0.35	(0.05–1.26)
Previous CT	2.06	(0.11–13.57)	2.83	(0.14–22.39)
Ever engaged in smoking	1.50	(0.09–7.22)	2.29	(0.12–14.00)
Ever engaged in alcohol use	1.44	(0.48–3.57)	1.25	(0.40–3.21)
Gravidity
0	Ref.	-	Ref.	-
≥1	0.76	(0.32–1.90)	0.59	(0.24–1.55)

Abbreviations: CT, Chlamydia trachomatis; PID, pelvic inflammation disease; PR, prevalence ratio.

*P < .05; **P < .01; ^***P < .001.