Table 2

Indicators of intellectual disability associated with congenital hypothyroidism among unscreened populations

Reference	Country	No tested	Birth years	Age at testing (years)	Measure	Indicator of intellectual disability
Reference	Country	No tested	Birth years	Age at testing (years)	Measure	Mean IQ	Percentage with low IQ	IQ range	Percentage in special schools
Alm et al17	Sweden	39	1969–1971	7–9	Wechsler Intelligence Scale for Children	88	8% <70	50–113	8
Alm et al17	Sweden	39	1969–1971	7–9	Wechsler Intelligence Scale for Children	88	16% <75	50–113	8
Alm et al18	Sweden	14	1977–1978	5	Griffith's Developmental quotient	87	14% <70	45–116	Not reported
Alm et al18	Sweden	14	1977–1978	5	Griffith's Developmental quotient	87	28% <80	45–116	Not reported
Frost et al20	England	45	1965–1975	7–15	Wechsler Intelligence Scale for Children—revised	82	NR	40–112	13
Hulse et al21	England	94	1957–1975	7 or older	Wechsler Intelligence Scale for Children—revised	82	27% <70	NR	29