Table 3.

Comparison of outdoor activities and skin exposure to UVB in children with deficient and adequate levels of 25-OHD measured after summer

Time spent outdoor (h/week)	Children with the level of 25-OHD < 50 nmol/L, n (%)	Children with the level of 25-OHD ≥ 50 nmol/L, n (%)	The body surface area exposed to UVB (%)	Children with the level of 25-OHD < 50 nmol/L, n (%)	Children with the level of 25-OHD ≥ 50 nmol/L, n (%)
Less than 2	7 (52.9%)	6 (46.1%)	< 10	5 (50%)	5 (50%)
2–6	88 (40.7%)	128 (59.3%)	10–50	122 (37.9%)	200 (62.1%)
7–10	64 (26.8%)	175 (73.2%)	> 50	29 (23.4%)	95 (76.6%)