Table 2 Average age at onset of depression stratified by target variables among depressed subjects (n = 681)

Sex

0.017*

 Male

37.57 ± 10.88

 Female

39.99 ± 10.36

Occupation status

0.001*

 Employed

37.49 ± 9.41

 Unemployed

40.27 ± 10.84

Level of education

 < 0.001*

 Illiterate

44.34 ± 11.19

 Primary education

37.54 ± 8.72

 Middle school education

33.83 ± 8.05

 Diploma

32.53 ± 6.38

 Post-diploma or higher

34.25 ± 8.87

Active smoker

0.454

 Yes

40.11 ± 11.80

 No

39.33 ± 10.21

Passive smoker

0.031*

 Yes

41.70 ± 11.74

 No

39.14 ± 10.28

Alcohol consuming

0.044*

 Yes

35.05 ± 9.35

 No

39.63 ± 10.52

Opioid use

0.017*

 Yes

36.95 ± 9.87

 No

39.84 ± 10.56

Diabetes

0.006*

 Yes

41.94 ± 11.25

 No

38.91 ± 10.27

Hypertension

 < 0.001*

 Yes

44.09 ± 11.03

 No

37.66 ± 9.73

Cardiovascular disease

 < 0.001*

 Yes

44.41 ± 12.29

 No

38.52 ± 9.86

Fatty liver disease

0.625

 Yes

39.87 ± 11.02

 No

39.38 ± 10.39

Chronic lung disease

0.755

 Yes

38.85 ± 11.16

 No

39.50 ± 10.49

Stroke

0.002*

 Yes

47.80 ± 11.60

 No

39.29 ± 10.42

Rheumatoid disease

0.189

 Yes

41.23 ± 11.30

 No

39.32 ± 10.43

Other psychiatric disorders

0.001*

 Yes

37.82 ± 10.34

 No

40.48 ± 10.50

EI (kcal/day) (r)

- 0.108

0.005*

BMI (Kg/m²) (r)

- 0.036

0.345

Physical activity (Met-h/day) (r)

- 0.039

0.312