Table 2.

Urinary iodine concentrations in pregnant women and school-aged children and thyroglobulin concentration in pregnant women in Zinder, rural Niger

	Median or n	Min–max or %
Pregnant women (n 662)
Urinary iodine
UIC (µg/l), median and min–max	69·0	38·1–114·3
Low UIC (<150 µg/l), n and %	562	84·9
Thyroglobulin and thyroid hormones (n 531)
DBS-Tg (µg/l), median and min–max	34·6	23·9–49·7
TSH (mU/l), median and min–max	0·9	0·6–1·3
TT4 (nmol/l), median and min–max	195·2	163·7–230·6
Subclinical hypothyroidism*, n and %	4	0·8
Overt hypothyroidism†, n and %	0	0·0
Hypothyroxaemia‡, n and %	7	1·3
School-aged children (n 373)
Urinary iodine
UIC (µg/l), median and min–max	100·9	61·2–163·2
Low UIC (<100 µg/l), n and %	184	49·3
Very low UIC (<50 µg/l), n and %	70	18·8

Min–max, minimum–maximum; UIC, urinary iodine concentration; DBS-Tg, dried blood spot thyroglobulin; TT₄, total thyroxine; TSH, thyroid-stimulating hormone.

^*Subclinical hypothyroidism defined as increased TSH (>3·0 mU/l) and normal TT₄ (97·5–247·5 nmol/l).

^†Overt hypothyroidism defined as increased TSH and low TT₄ (<97·5 nmol/l).

^‡Hypothyroxaemia defined as low TT₄ (<97·5 nmol/l).