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Table 1 Background characteristics of participants (n = 55)

From: Changes in the vitamin D endocrine system and bone turnover after oral vitamin D3 supplementation in healthy adults: results of a randomised trial

Age, years, mean (range)

28 (19–48)

Gender, n (%) women

35 (63.6)

Body mass index, kg/m2, mean (SD)

23.7 (3.8)

Daily use of vitamin D-containing butter or margarine on bread or in cooking, n (%)

25 (45.5)

Regular consumption of vitamin D enriched milk, n (%)

14 (25.5)

Intake of fatty fish at least twice a week, n (%)

32 (58.2)

Habitual use of dietary supplements other than vitamin D, n (%)

7 (12.7)

Common use of sunscreen on sunny days, n (%)

18 (32.7)

Exposes skin to direct sunlight > 10 minutes on sunny days, n (%)

49 (89.1)

Spends on average more than 2 hours outdoors during a sunny week, n (%)

36 (65.5)