To understand nutritional rickets in Bangladesh better, 14 rachitic and 13
'unaffected' children were evaluated. Seventy per cent of children with act
ive rickets had no evidence of either vitamin D deficiency or familial rick
ets. Rickets in Bangladesh is probably related to calcium deficiency. Abnor
malities in 'unaffected' children suggest that subclinical calcium insuffic
iency is common.