Table 2.
Prevalence estimates of genital Chlamydia trachomatis infection in the Belgian population aged 16–59 years
| 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) |
CT: Chlamydia trachomatis; y/o: years of age
aParticipants' weights were calculated based on the percentage of responses divided by percentage of invitations sent, per gender and age group
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