Prevalence of Chlamydia trachomatis infection in parturient women in Gipuzkoa, Northern Spain

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Table 1 Prevalence of C. trachomatis infection by age and country of origin in puerperal women from the San Sebastián area, Basque Country, Spain (2011–2014)

Age^a (years)	Total				Native				Foreign immigrants				P
Age^a (years)	No.	CT+	(%)	(95 % CI)	No.^b	CT+	(%)	(95 % CI)	No.^b	CT+	(%)	(95 % CI)	P
<25	596	38	(6.4)^c	(4.7–8.6)	247	14	(5.7)	(3.4–9.3)	349	24	(6.9)	(4.7–10.0)	0.552
25–29	1799	35	(2.0)	(1.4–2.7)	1164	16	(1.4)	(0.9–2.2)	635	19	(3.0)	(1.9–4.6)	0.018
30–34	4710	26	(0.6)	(0.4–0.8)	4065	18	(0.4)	(0.3–0.7)	645	8	(1.2)	(0.6–2.4)	0.019^d
≥35	4582	22	(0.5)	(0.3–0.7)	4073	16	(0.4)	(0.2–0.6)	509	6	(1.2)	(0.6–2.5)	0.029^d
Total	11,687	121	(1.0)^e	(0.9–1.2)	9549	64	(0.7) ^e	(0.5–0.8)	2138	57	(2.7)^e	(2.1–3.4)	<0.001

^aMedian age 33 years, range 14–54
^bNumber estimated on the basis of randomized stratified sampling in women giving birth in the Donostia University Hospital during the study period (see “Methods”). The origin of Chlamydia-positive women was individually collected after their detection in screening
^cPrevalence was 9.6 % (95 % CI 5.6–16.0) (12/125) and 5.5 % (95 % CI 3.8–8.0) (26/471) in women younger than 20 years and those aged 20–24 years old, respectively
^dFisher exact test (two tailed)
^eAge-adjusted prevalence was 1.0 % (95 % CI 0.8–1.2) for the entire group and was 0.8 % (95 % CI 0.6–1.0) and 1.9 % (95 % CI 1.3–2.5) for native women and foreign immigrants, respectively, Chi square = 20.54, P < 0.001