Table 2.
Mean 25(OH)D levels, based on different cut-off points defined using a study-specific sensitivity analysis cut-off, the Institute of Medicine definitions and the Endocrine Society Practice Guidelines, among the study population of children aged 6–36 months (n 516) residing in five low-SES peri-urban neighbourhoods near Quito, Ecuador, June–July 2003
| Overall | 25(OH)D (nmol/l) | ||||
|---|---|---|---|---|---|
| Cut-off (nmol/l) | n | % | Mean | sd | |
| Study-specific cut-off for undernutrition | |||||
| Low 25(OH)D | <42·5 | 96 | 18·6 | 34·9 | 5·7 |
| Referent | ≥42·5 | 420 | 81·4 | 63·1 | 15·0 |
| Institute of Medicine( 30 ) | |||||
| At risk of deficiency | <30 | 18 | 3·5 | 25·5 | 4·2 |
| Risk of inadequacy | 30–47·5 | 163 | 31·6 | 41·9 | 5·2 |
| Sufficient | ≥50 | 335 | 64·9 | 67·4 | 14·0 |
| Endocrine Society Practice Guidelines( 26 ) | |||||
| Deficient | <50 | 181 | 35·1 | 40·4 | 7·2 |
| Insufficient | 50–72·5 | 229 | 44·4 | 59·4 | 6·0 |
| Sufficient | >72·5 | 106 | 20·5 | 84·6 | 10·2 |
25(OH)D, 25-hydroxyvitamin D; SES, socio-economic status.