Table 2.

Pregnancy outcomes of women and their association with Chlamydia trachomatis infection

Outcomes	Chlamydia trachomatis infection
	Negative	Positive	Percentage positive (95% CI)	P-value*
All outcomes (n = 4,055)
All women enrolled	3,898	157	3.9 (3.3–4.5)
Live pregnancy outcomes (n = 4,055)
Live singleton birth	3,780	151	3.8 (3.2–4.4)	1.0 (reference)
Live twin birth	30	4	11.8 (0.3–21.9)	0.05
Lost to follow up	26	2	7.1 (0.0–17.3)	0.29
Adverse pregnancy outcomes
Demise (n = 4,055)
Miscarriage	11	0	0	1.00
Perinatal death	51	0	0	0.27
Gestational age** (n = 3,913)
Term, ≥ 37 weeks	3,583	140	3.8 (3.2–4.4)	1.0 (reference)
Prematurity, < 37 weeks	180	10	5.3 (2.1–8.5)	0.33
Prematurity, < 35 weeks	57	7	10.9 (3.1–18.8)	0.01
Prematurity, < 32 weeks	18	4	18.2 (0.7–36.7)	0.01
Birthweight** (n = 3,913)
≥ 2,500 g	3,589	140	3.8 (3.1–4.4)	1.0 (reference)
< 2,500 g	174	10	5.4 (2.1–8.7)	0.25

* P-value (Chi-square or Fishers exact test) for comparison of Chlamydia trachomatis prevalence with respective outcome categories of live singleton birth, gestational age ≥ 37 weeks, and birthweight ≥ 2,500 gram

** Including live singleton birth outcomes only