Vitamin D, oral health, and disease characteristics in juvenile idiopathic arthritis: a multicenter cross-sectional study

Table 2 Serum and dietary vitamin D status in the NorJIA study population, N = 223

Serum and dietary vitamin D		Values
Serum 25(OH) vit. D^a, nmol/L, mean (± SD)		61.4 (± 22.3)
Serum 25(OH) vit. D in categories, n (%)
Deficient < 30 (nmol/L)		15 (6.7)
Insufficient 30–49 (nmol/L)		51 (22.9)
Sufficient 50–74 (nmol/L)		100 (44.8)
Desired ≥ 75–150 (nmol/L)		57 (25.6)
Seasonal serum 25(OH) vit. D^b, nmol/L, mean (± SD)
Winter, December-February (n = 49)		51.4 (± 21.2)
Spring, March–May (n = 66)		55.6 (± 18.8)
Summer, June–August (n = 25)		72.5 (± 21.6)
Fall, September–November (n = 83)		68.8 (± 22.1)
Daily vit. D intake^c, µg/day, mean (± SD)		11.2 (± 12.2)
Northern Norway (n = 51)		7.7 (± 8.4)
Western Norway (n = 74)		9.9 (± 11.8)
Central Norway (n = 93)		14.0 (± 13.6)
Inadequate intake^d, < 10 µg/day, n (%)		144 (66.1)
Supplemental vit. D intake, n (%)		164 (75.2)
Northern Norway		34 (66.7)
Western Norway		49 (66.2)
Central Norway		81 (87.1)

NorJIA study, Norwegian juvenile idiopathic arthritis study; vit. D, vitamin D; SD, standard deviation
^aSerum 25(OH) vitamin D collected during the study visits taking place throughout the calendar year, except for July
^bSerum 25(OH) vitamin D collected during the four specified seasons
^cEstimates of daily vit. D intake (dietary and supplemental) based on data from self-reported food frequency questionnaires (FFQ), n = 218 (5 participants did not fill in the FFQ), 164 participants reported supplemental vitamin D intake
^d10 µg/day is the daily recommended intake of vit. D according to The Norwegian Directorate of Health and Nordic Nutrition Recommendations 2012 (5 participants did not fill in the FFQ)

ISSN: 1472-6831