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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