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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

GroupNMedian (Interquartile Range) (nmol/L)Percentile
(p25-p75) (nmol/L)
P-valueSevere 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
 Spring829942.00 (19.73)(31.07–50.80) 11.960.626.41.1 
 Summer10,11141.76 (18.20)(32.60–50.80) 10.762.125.41.8 
 Autumn918843.13 (17.80)(34.30–52.10) 7.861.529.41.2 
 Winter681945.10 (21.67)(33.28–54.96) 9.254.433.82.6 
Categorical age  < 0.001    < 0.001
 18–2478239.42 (17.82)(30.99–48.81) 11.966.620.21.3 
 25–2914,07042.00 (19.22)(31.84–51.06) 10.961.226.61.4 
 30–3516,28343.46 (18.77)(33.75–52.53) 9.159.429.71.8 
  > 35328244.19 (19.28)(34.00–53.28) 9.257.231.72.0 
Year   < 0.001    < 0.001
 2014645941.45 (17.96)(32.97–50.93) 5.666.926.61.0 
 2015863939.30 (20.49)(29.67–50.17) 13.860.823.71.7 
 2016974038.87 (21.21)(28.76–49.97) 17.158.023.02.0 
 2017957947.80 (14.00)(41.00–55.00) 2.156.939.31.7 
Total34,41742.87 (19.02)(32.88–51.90) 9.960.128.41.6