Table 4.
Prevalence (per 10,000 births) and prevalence ratio of microtia-anotia by main surveillance program methodological characteristics
| No. of programs | No. of cases | Prevalence (per 10,000 births) | Prevalence ratio | 95% CI | ||
|---|---|---|---|---|---|---|
| Coverage | ||||||
| Population-based | 58 | 5,089 | 1.68 | 1.00 | Referent | |
| Hospital-based | 8 | 3,828 | 2.97 | 1.77 | 1.70 | 1.85 |
| ETOPFA a | ||||||
| Reported | 34 | 3,975 | 1.84 | 1.00 | Referent | |
| Not reported | 25 | 3,141 | 1.74 | 0.95 | 0.90 | 0.99 |
| Type of surveillance system b | ||||||
| Active | 11 | 1,902 | 2.48 | 1.00 | Referent | |
| Passive | 13 | 630 | 0.94 | 0.38 | 0.35 | 0.41 |
a
ETOPFA = elective termination of pregnancy for a fetal anomaly. ETOPFA not permitted in seven surveillance programs
b
Classification used only by the US programs