Table 2 Demographic characteristics, life style, job-relate variables of participants across two classes of QoL

Gender

 Male

547(88.1)

2256(92.4)

0.001

 Female

74(11.9)

186 (7.6)

Marital status

 Married

568(91.5)

2190(89.7)

0.185

 Single

53(8.5)

252(10.3)

Education level

0.193

 0–5 years

41(6.6)

214(8.8)

 6–12

389(62.6)

1519(62.2)

  > 12

191 (30.8)

709(29)

Smoking status

 Non smokers

416(67)

1755(71.9)

0.017

 Current or former smoker

205(33)

687(28.1)

Shift work

0.001

 Daily (daily shift)

316(50.9)

1064(43.6)

 Shift (rotating shift work)

305(49.1)

1378(56.4)

Second job

yes

54(8.7)

231(9.5)

0.559

Age (years)

38.48 ± 7.22

36.26 ± 7.26

 < 0.001

BMI (Kg/m²)

26.09 ± 4.11

25.46 ± 3.70

 < 0.001

Physical activity (METs hour/week)

9.20 ± 14.51

9.97 ± 15.55

0.26

Sleep duration (hour)

6.91 ± 1.22

7.16 ± 1.15

 < 0.001

Income (Rials)

 < 0.001

 < 5,000,000

90 (14.5)

391(16)

 5,000,000–8000000

285(45.9)

1301(53.3)

 8,000,000- 12,000,000

164(26.4)

496(20.3)

  > 12,000,000

80(12.9)

246(10.1)

 No answer

2(0.3)

8(0.3)