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Parental questionnaire response percentage.
| Question category | n of answered questions/n of parental questionnaires (%) |
|---|---|
| Vision | 3,985/5,391 (74%) |
| Speech | 4,795–5,054/5,391 (89.0–93.7%) |
| Hearing | 3,035–5,391/5,391 (56.3–100%) |
Children with maternal thyroid function data available and intelligence quotient >85 included in the analysis, total n = 5,391.
