Table 1 Levels of serum 25(OH) D concentrations among different seasons, age groups and years
From: Prevalence of vitamin D deficiency in the pregnant women: an observational study in Shanghai, China
Group | N | Median (Interquartile Range) (nmol/L) | Percentile (p25-p75) (nmol/L) | P-value | Severe deficiency (< 25 nmol/L) (%) | Deficiency (25-50 nmol/L) (%) | Insufficiency (50-75 nmol/L) (%) | Adequate (≥75 nmol/L) (%) | P-value |
|---|---|---|---|---|---|---|---|---|---|
Season |  |  |  | < 0.001 |  |  |  |  | < 0.001 |
 Spring | 8299 | 42.00 (19.73) | (31.07–50.80) |  | 11.9 | 60.6 | 26.4 | 1.1 |  |
 Summer | 10,111 | 41.76 (18.20) | (32.60–50.80) |  | 10.7 | 62.1 | 25.4 | 1.8 |  |
 Autumn | 9188 | 43.13 (17.80) | (34.30–52.10) |  | 7.8 | 61.5 | 29.4 | 1.2 |  |
 Winter | 6819 | 45.10 (21.67) | (33.28–54.96) |  | 9.2 | 54.4 | 33.8 | 2.6 |  |
Categorical age |  |  | < 0.001 |  |  |  |  | < 0.001 | |
 18–24 | 782 | 39.42 (17.82) | (30.99–48.81) |  | 11.9 | 66.6 | 20.2 | 1.3 |  |
 25–29 | 14,070 | 42.00 (19.22) | (31.84–51.06) |  | 10.9 | 61.2 | 26.6 | 1.4 |  |
 30–35 | 16,283 | 43.46 (18.77) | (33.75–52.53) |  | 9.1 | 59.4 | 29.7 | 1.8 |  |
  > 35 | 3282 | 44.19 (19.28) | (34.00–53.28) |  | 9.2 | 57.2 | 31.7 | 2.0 |  |
Year |  |  |  | < 0.001 |  |  |  |  | < 0.001 |
 2014 | 6459 | 41.45 (17.96) | (32.97–50.93) |  | 5.6 | 66.9 | 26.6 | 1.0 |  |
 2015 | 8639 | 39.30 (20.49) | (29.67–50.17) |  | 13.8 | 60.8 | 23.7 | 1.7 |  |
 2016 | 9740 | 38.87 (21.21) | (28.76–49.97) |  | 17.1 | 58.0 | 23.0 | 2.0 |  |
 2017 | 9579 | 47.80 (14.00) | (41.00–55.00) |  | 2.1 | 56.9 | 39.3 | 1.7 |  |
Total | 34,417 | 42.87 (19.02) | (32.88–51.90) |  | 9.9 | 60.1 | 28.4 | 1.6 |  |