Comparisons of Waltham Forest prevalence of moderate and worse PCHI with national data
| Report | Cohort period | Population | Prevalence or yield/1000 (95% CI) | Pearson's χ2 | |
|---|---|---|---|---|---|
| Prevalence from cohort studies | Waltham Forest | 1992– 2002 | 35 668 | Bilateral 1.51/1000 (1.11 to 1.92) | NA |
| MRC Trent study | 1985– 1990 | 366 480 | Bilateral 1.33/1000 (1.22 to 1.46) | 0.829* | |
| UK national PCHI ascertainment | 1988– 1993 | 4 697 700 | Bilateral 1.44/1000 (1.41 to 1.48) | 0.128* |
↵* p>0.10.
MRC, Medical Research Council; PCHI, permanent congenital hearing impairment.