Table 1 Characteristics of the participants with serum 25(OH)D3 means and 95% confidence intervals (n = 3220)
Variable | n | % | Mean(ng/mL) | 95%CI | P value |
|---|---|---|---|---|---|
Age | – | – | |||
16–17 | 63 | 2.0 | 19.62 | (17.94–21.30) | 0.130 |
18–19 | 2697 | 83.8 | 18.42 | (18.18–18.66) | |
20–26 | 460 | 14.3 | 18.91 | (18.27–19.55) | |
Gender | |||||
Male | 960 | 29.8 | 21.41 | (20.94–21.87) | < 0.001 |
Female | 2260 | 70.2 | 17.28 | (17.05–17.52) | |
Region of original residence | |||||
City | 2017 | 62.6 | 17.83 | (17.56–18.11) | < 0.001 |
Town | 410 | 12.7 | 19.34 | (18.68–19.99) | |
Countryside | 793 | 24.6 | 19.82 | (19.35–20.28) | |
Ethnicity | |||||
The Han Ethnic | 3050 | 94.7 | 18.52 | (18.29–18.75) | 0.767 |
The minorities | 170 | 5.3 | 18.37 | (17.31–19.43) | |
Latitude | |||||
15° N–24° N | 108 | 3.4 | 21.45 | (20.11–22.79) | < 0.001 |
25° N–34° N | 2749 | 85.4 | 18.44 | (18.19–18.68) | |
35° N–44° N | 331 | 10.3 | 18.31 | (17.68–18.95) | |
45° N–54° N | 32 | 1.0 | 17.15 | (15.03–19.28) | |
Longitude | |||||
75° E–94° E | 56 | 1.7 | 15.66 | (14.32–16.99) | < 0.001 |
95° E–114° E | 570 | 17.7 | 20.34 | (19.79–20.89) | |
115° E–134° E | 2594 | 80.6 | 18.17 | (17.92–18.42) | |