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Table 1 Vitamin D serum concentration according to variables

From: Association between serum vitamin D and depressive symptoms among female workers in the manufacturing industry

Variables   Vitamin D (ng/mL) Mean (S.D)b Vitamin D  
  ≥10 ng/mL <10 ng/mL p-valuea
  N % N %  
Total   9.07 3.25 333 (31.6) 721 (68.4)  
Age (years) <30 8.86 3.12 220 (28.8) 545 (71.2) 0.001
  ≥30 9.61 3.54 113 (39.1) 176 (60.9)  
Shift work Yes 8.89 3.23 253 (29.0) 619 (71.0) <0.001
  No 9.94 3.25 80 (44.0) 102 (56.0)  
Regular exercise (times per week) ≥3 9.09 4.12 47 (31.8) 101 (68.2) 0.963
<3 9.06 3.09 286 (31.6) 620 (68.4)  
Smoking habit Current 8.81 3.21 47 (25.7) 136 (74.3) 0.058
  Never/former 9.12 3.26 286 (32.8) 585 (67.2)  
Risky drinkingc Yes 9.56 3.25 63 (38.0) 103 (62.0) 0.055
  No 8.97 3.25 270 (30.4) 618 (69.6)  
Body Mass Index (kg/m2) <18.5 8.32 2.94 34 (24.5) 105 (75.5) 0.125
18.5–24.9 9.15 3.34 238 (32.6) 493 (67.4)  
  >25 9.31 3.07 61 (33.2) 123 (66.8)  
  1. acomparison by chi-squared test
  2. bcomparison by Student’s t-test
  3. cRisky drinking: two or more times per week and five or more glasses each time