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Table 3 Prevalence and odds of CT and NG infections by study area and anatomical site

From: Anatomical site prevalence and genotypes of Chlamydia trachomatis infections among men who have sex with men: a multi-site study in China

City

Sample size

Chlamydia infection n; %(95% CIs*)

Gonococcal infection n; %(95% CIs*)

Total a

Anorectal site

Pharyngeal site

Urethral site

Total

Anorectal site

Pharyngeal site

Urethral site

Nanjing

102

18

17.6(11.0–26.7)

14

13.7(8.0–22.3)

4

3.9(1.3–10.3)

2

2(0.4–7.7)

8

7.8(3.7–15.3)

6

5.9(2.4–12.9)

2

2.0(0.4–7.7)

0

0

Shenzhen

182

41

22.5(16.8–29.4)

35

19.2(13.9–25.8)

2

1.1(0.2–4.3)

7

3.8(1.7–8.0)

14

7.7(4.4–12.8)

8

4.4(2.1–8.8)

4

2.2(0.7–5.9)

3

1.6(0.4–5.1)

Wuhan

95

10

10.5(5.4–18.9)

10

10.5(5.4–18.9)

0

0

3

3.2(0.8–9.7)

7

7.4(3.3–15.1)

5

5.3(2.0–12.5)

2

2.1(0.4–8.1)

0

0

Total

379

69

18.2(13.9–22.5)

59

15.6(11.6–19.5) b

6

1.6(0.3–2.9)

12

3.2(1.4–5.0)

29

7.7(5.3–11.0)

19

5.0(3.1–7.8) c

8

2.1(1.0–4.3)

3

0.8(0.2–2.5)

  1. * CIs: confidence intervals
  2. a Statistically significant difference (P = 0.048, chi-square test) in proportions of chlamydia infection in Nanjing, Shenzhen and Wuhan
  3. b Statistically significant difference (P = 0.011, chi-square test) in proportions of chlamydia infection between anorectal site and urethral site
  4. c Statistically significant difference (P < 0.001,chi-square test) between proportions of anorectal chlamydia infection and proportions of anorectal gonococcal infection