5 Gujarati F, 34 years (Gujarat region India; n = 71) 51% < 12.5 Solanki et al. [31] United Kingdom, Birmingham, end of winter. White buy BAY 80-6946 M, <65 years, mean 30 years men and women (n = 4) 28 ± 12 – White F, <65 years, mean 30 years men and women (n = 12) 48 ± 29 White M, >65 years, mean 74 years men and women (n = 4) 55 ± 14 White F, >65 years, mean 74 years men

and women (n = 14) 40 ± 21 Asian M, <65 years, mean 31 years men and women (n = 14) 16 ± 08 Asian F, <65 years, mean 31 years men and women (n = 3) 21 ± 07 Asian M, >65 years, mean 72 years men and women (n = 21) 13 ± 09 Asian F, >65 years, mean 72 years men and women (n = 16) 23 ± 20 Finch et al. [32] United Kingdom, London, all year round. White M (50%)+F, mean 39 years, Protein Tyrosine Kinase inhibitor winter (n = 30) 39 ± 18 Winter season (March/April), vegetarian,

Hindu religion, Muslim religion (only in winter); Hindus seasonal responses are blunted, resulting in significantly lower peak values than for whites PD98059 or non-vegetarian (Muslim) Asians White M (50%)+F, mean 39 years, summer (n = 18) 65 ± 27 Asian M (70%)+F, mean 42 years, non-vegetarians, winter (n = 116) 19 ± 13 Asian M (70%)+F, mean 42 years, non-vegetarians, summer (n = 22) 45 ± 24 Asian M (40%)+F, mean 42 years, vegetarians, winter (n = 29) 10 ± 8 Asian M (40%)+F, mean 42 years, vegetarians, summer (n = 16) 27 ± 21 Van der Meer et al. [1] The Netherlands, Amsterdam, The Hague, Amersfoort and Haarlem (52°N) Dutch M (40%)+F, median 45 years (n = 102) Median 67, 06% < 25 Autumn or winter season, pregnant or breastfeeding, lower consumption of fatty fish, no use of vitamin D supplements, smaller area of uncovered skin, no use of tanning bed, lower consumption of margarine, no preference for sun Surinam South Asian M (37%)+F, median 41 years (n = 107) Median 24, 51% < 25 Pregnant women Datta et al. [63] IMP dehydrogenase United Kingdom, Cardiff (51.5°N), at booking visit Indian subcontinent (n = 100) 52% < 20 Being in Britain for more than 3 years (compared to less than 3 years and to being born in Britain) Children Lawson and Thomas [40]

UK, autumn Bangladeshi M+F, 2 years (n = 139) 42 ± 21, 20% < 25 Failure to take a vitamin supplement. Pakistani M+F, 2 years (n = 200) 36 ± 20, 34% < 25 Indian M+F, 2 years (n = 279) 42 ± 23, 25% < 25 Koch and Burmeister [64] Germany, in summer Asian M (33%)+F, 3–17 years (Birma, Sri Lanka, India; n = 9) 28 ± 09, 44% < 25 – SD standard deviation a Unless mentioned otherwise Table 6 Studies among Indian populations in India Study Study characteristics Study population Serum 25(OH)D (nmol/l) Mean ± SD a Determinants for lower serum 25(OH)D Adults Goswami et al. [19] India, Delhi, in winter Adult M, mean 31 years (n = 244) 18 ± 9 – Adult F, mean 35 years (n = 398) 17 ± 11 Goswami et al. [41] India, Agota village (29° N), in winter Adult M, rural, mean 43 years (n = 32) 44 ± 24 Female gender Adult F, rural, mean 43 years (n = 25) 27 ± 16 Harinarayan et al.