Table 4

Median age at diagnosis of CHI and percentage diagnosed by six months with bilateral hearing loss at different severities of impairment; pre-VIHSP (1989) and post-VIHSP (1993) birth cohorts

nMedian age at diagnosis (mth)% diagnosed by 6 months of age
Severity of HIPre-VIHSPPost-VIHSPPre-VIHSPPost-VIHSPp value*Pre-VIHSPPost-VIHSPp value
*Mann–Whitney U test.
†Mild not included, as not the target of VIHSP.
‡Fisher's exact test, §χ2 test.
Mild = 21–40 dB HL; moderate = 41–60 dB HL; severe = 61–90 dB HL; profound = >90 dB HL.
Mild264939.652.10.07 3.84.1 1.0‡
Moderate313836.425.10.55 3.210.5 0.25‡
Severe222022.411.20.003 035.0<0.01‡
Profound261110.39.90.2915.436.4 0.16‡
Moderate + severe + profound†796920.314.20.18 6.321.7<0.01§