Chlamydia infection, PID, and infertility: further evidence from a case–control study in China

BMC Women's Health

Table 3 Association between PID and infertility, stratified by parity

Exposure	Cases: primary infertility (n = 168)				Cases: secondary infertility (n = 87)
	Controls: non-pregnant women (n = 336)		Controls: pregnant women (n = 336)		Controls: non-pregnant women (n = 174)		Controls: pregnant women (n = 174)
	aOR (95% CI)^a	P	aOR (95% CI)^a	P	aOR (95% CI)^a	P	aOR (95% CI)^a	P
PID
No	Referent		Referent		Referent		Referent
Yes	4.41 (1.21, 16.12)	0.03	3.78 (1.15, 12.41)	0.03	1.91 (0.54, 6.76)	0.31	9.62 (1.70, 54.39)	0.01

^aaOR, adjusted OR, adjusted for maternal age, BMI, monthly income, chronic disease, other genital tract infection and chlamydia infection history

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