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Table 2 Prevalence estimates of genital Chlamydia trachomatis infection in the Belgian population aged 16–59 years

From: Prevalence estimates of genital Chlamydia trachomatis infection in Belgium: results from two cross-sectional studies

  CT1 study   CT2 study
Total, N (%) Crude prevalence, N (%) Weighteda prevalence, % (95% CI) Total, N (%) Crude prevalence, N (%) Weightedb prevalence, % (95% CI)
Total 770 11 (1.43) 1.54 (0.78–3) Total 763 10 (1.31) 1.76 (0.63–4)
Gender Gender
Male 348 (45%) 5 (1.44) 1.75 (0.62–4) Male 351 (46%) 3 (0.86) 2.25 (0.45–6)
Female 422 (55%) 6 (1.42) 1.32 (0.52–3) Female 412 (54%) 7 (1.70) 1.29 (0.39–3)
Age groups total Age groups total
16–29 y/o 181 (24%) 3 (1.66) 1.54 (0.38–4) 18–29 y/o 125 (16%) 3 (2.40) 3.54 (0.35–13)
30–44 y/o 279 (36%) 5 (1.79) 2.07 (0.69–5) 30–44 y/o 299 (39%) 2 (0.67) 1.04 (0.08–4)
45–59 y/o 310 (40%) 3 (0.97) 1.01 (0.24–3) 45–59 y/o 339 (44%) 5 (1.47) 1.56 (0.44–4)
Age groups men Age groups men
16–29 y/o 86 (25%) 2 (2.33) 2.15 (0.34–7) 18–29 y/o 59 (17%) 1 (1.69) 5.57 (0.30–23)
30–44 y/o 114 (33%) 2 (1.75) 2.40 (0.39–7) 30–44 y/o 130 (37%) 1 (0.77) 2.07 (0.11–9)
45–59 y/o 148 (43%) 1 (0.68) 0.81 (0.04–4) 45–59 y/o 162 (46%) 1 (0.62) 0.66 (0.04–3)
Age groups women Age groups women
16–29 y/o 95 (23%) 1 (1.05) 0.91 (0.05–4) 18–29 y/o 66 (16%) 2 (3.03) 1.12 (0.15–4)
30–44 y/o 165 (39%) 3 (1.82) 1.75 (0.43–5) 30–44 y/o 169 (41%) 1 (0.59) 0.16 (0.08–1)
45–59 y/o 162 (38%) 2 (1.23) 1.22 (0.2–4) 45–59 y/o 177 (43%) 4 (2.26) 2.40 (0.53–6)
  1. CT: Chlamydia trachomatis; y/o: years of age
  2. aParticipants' weights were calculated based on the percentage of responses divided by percentage of invitations sent, per gender and age group
  3. bPost-stratification weights were calculated based on cross classified data on age, gender and province of residence from the national register. Additionally, the selection probability of an individual in the household (1 if household size ≤ 4, < 1 if household size > 4) was taken into account in the calculation of the weights. Household was included as a cluster variable