вот как раз информация про витамин д дефицит у финнов в сравнении с русскими эмигрантами, что территориально близко к СПб:
Participants: Immigrants aged 18-64 years (446 Russians, 346 Somalis, 500 Kurds), 798 Finns aged 30-64 years.
Results:
The mean of S-25(OH)D was 64 (95 % CI 62, 66) for Russians, 44 (95 % CI 41, 46) Somalis, 35 (95 % CI 34, 37) Kurds and 64 (95 % CI 62, 66) nmol/l Finns. S-25(OH)D among Somalis and Kurds was lower compared with Finns (P < 0·001).
The prevalence of vitamin D deficiency (S-25(OH)D <30 nmol/l) and insufficiency (S-25(OH)D <50 nmol/l) was higher among immigrants than Finns (P < 0·001). Vitamin D-rich foods differed between the groups; vitamin D-fortified fat spread consumption was higher among Somalis (91 %) than among Russians (73 %) and Kurds (60 %); fish was less consumed among Kurds (17 %) than among Russians (43 %) and Somalis (38 %); and 57 % Russians, 56 % Kurds and 36 % Somalis consumed vitamin D-fortified dairy daily (P < 0·001 for all).
Daily smoking, alcohol consumption and winter blood sampling were determinants of vitamin D insufficiency (P ≤ 0·03).
Older age, physical activity, fish and vitamin D-fortified dairy consumption were associated with lower odds of insufficiency (P ≤ 0·04).
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Public Health Nutr. 2020 May;23(7):1254-1265. doi: 10.1017/S1368980019004312.
Prevalence and determinants of vitamin D deficiency and insufficiency among three immigrant groups in Finland: evidence from a population-based study using standardised 25-hydroxyvitamin D data
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