Table 1 Demographic, occupational characteristics, and laboratory parameters of the workers under study

Quantitative variables

Mean

S.D.^*

Min

Max

 Age (year)

32.23

6.14

22

59

 Work experience (year)

7.9

3.3

3

14

 Number of shifts per week

1.3

0.7

1

4

 Number of hours of work shift

8

0.4

4

12

 Hemoglobin (gr/dl)

12.03

1.91

9

16

 MCV (μm³)

81.64

6.23

48

95

 Ferritin (ng/ml)

27.54

2.21

4

89

 TIBC (μg/d)

352.94

11.49

108

500

Qualitative variables

Number

%

 Sex

  Male

85

39.4

  Female

131

60.6

 Education level

  Non-academic

177

81.9

  Academic

39

18.1

 Iron deficiency anemia

  Male

   <13

18

21.2

   >13

67

78.8

  Female

   <12

91

69.5

   >12

40

30.5