TABLE 5.
Prevalence of standardized serum 25(OH)D concentrations <30 and <50 nmol/L for 4 national nutritional/health surveys based on weighted data, stratified by extended winter and summer1
| % Serum 25(OH)D <30 nmol/L |
% Serum 25(OH)D <50 nmol/L |
|||||
| Study (country; n) (ref) | Yearly | Extended winter | Extended summer | Yearly | Extended winter | Extended summer |
| KiGGS (Germany; n = 10,015) (25) | 12.5 | 21.1 | 5.7 | 45.6 | 64.3 | 30.7 |
| DEGS (Germany; n = 6995) (27, 28) | 15.2 | 25.5 | 6.9 | 56.0 | 74.9 | 40.7 |
| NDNS: Rolling Program Year 1–4 (United Kingdom; n = 1488) (26) | 22.1 | 31.8 | 15.3 | 55.4 | 69.3 | 45.7 |
| NANS (Ireland; n = 1118) (14) | 12.4 | 19.7 | 6.6 | 46.0 | 61.2 | 35.4 |
1
Extended winter: November–March; extended summer: April–October. Values are based on weighted estimates. DEGS, German Health Interview and Examination Survey for Adults; KiGGS, German Health Interview and Examination Survey for Children and Adolescents; NANS, National Adult Nutrition Survey; NDNS, National Diet and Nutrition Survey; ref, reference; 25(OH)D, 25-hydroxyvitamin D.