Table 2.
Mean 25(OH)D concentrations by population sub-group, stratified by sex.
| Adjusteda Mean (95% CI) | p-interaction | ||
|---|---|---|---|
| Female | Male | ||
| Age group, years | |||
| 18–29 | 23.8 (23.2, 24.3) | 21.2 (20.2, 22.2) | < 0.001 |
| 30–44 | 25.8 (25.5, 26.1) | 23.6 (23.0, 24.2) | |
| 45–59 | 24.4 (24.1, 24.7) | 24.1 (23.5, 24.7) | |
| 60–74 | 23.6 (23.3, 23.9) | 24.7 (23.8, 25.6) | |
| ≥ 75 | 21.1 (20.6, 21.7) | 22.1 (20.5, 23.7) | |
| P-trend | < 0.001 | 0.001 | |
| Season | |||
| Summer/fall | 26.0 (25.7, 26.2) | 27.2 (26.6, 27.8) | < 0.001 |
| Winter/spring | 23.2 (23.0, 23.4) | 21.1 (20.7, 21.6) | |
| P-difference | < 0.001 | < 0.001 | |
| Year | |||
| 2013–2014 | 24.8 (24.4, 25.3) | 25.9 (24.9, 26.9) | < 0.001 |
| 2015 | 24.3 (23.8, 24.8) | 25.4 (24.3, 26.6) | |
| 2016 | 24.7 (24.3, 25.1) | 25.3 (24.4, 26.3) | |
| 2017 | 24.3 (24.0, 24.5) | 24.3 (23.6, 25.1) | |
| 2018 | 23.9 (23.6, 24.2) | 21.0 (20.5, 21.6) | |
| P-trend | 0.001 | < 0.001 | |
| Federal district | |||
| Central | 24.7 (24.4, 24.9) | 24.2 (23.7, 24.8) | < 0.001 |
| Far Eastern | 27.2 (26.4, 28.0) | 29.0 (27.1, 30.9) | |
| North Caucasian | 19.0 (18.3, 19.8) | 22.1 (20.2, 24.0) | |
| Northwestern | 24.4 (23.9, 24.8) | 19.2 (18.5, 19.8) | |
| Siberian | 24.4 (24.0, 24.8) | 25.1 (23.9, 26.2) | |
| South | 23.8 (23.1, 24.5) | 27.1 (25.4, 28.8) | |
| Ural | 25.3 (24.6, 26) | 26.1 (24.2, 27.9) | |
| Volga | 23.2 (22.6, 23.8) | 26.2 (24.8, 27.6) | |
| P-difference | < 0.001 | < 0.001 | |
Data are from 2013 to 2018 and are from all months of the year. a Values represent age group, season, year of data collection and federal district adjusted means estimated via marginal values following the fitting of a linear regression model.