Table 1 Characteristics of participants of the paper and water bottling factories workers (N = 411)

Sex

Male

130 (63.1)

91 (44.4)

221 (53.8)

Female

76 (36.9)

114 (55.6)

190 (46.3)

 < 0.001^a

Age (in year)

18–25

66 (32.0)

100 (48.8)

166 (40.4)

26–34

67 (32.5)

93 (45.4)

160 (38.9)

 ≥ 35

73 (35.)

12 (5.9)

85 (20.7)

 < 0.001^a

Mean (± SD)

31.2 (± 8.6)

26.36 (± 4)

28.8 (± 7.1)

 < 0.001^b

Marital status

Single

84 (40.8)

87 (42.4)

171 (41.6)

Married

97 (47.1)

103 (50.2)

200 (48.7)

Widowed/Widower

25 (12.1)

15 (7.3)

40 (9.7)

0.255^a

Educational status

Primary school

35 (17)

18 (8.8)

53 (12.9)

 < 0.001^a

Secondary school

78 (37.9)

117 (57.1)

195 (47.5)

More than 12 years of education

93 (45.2)

70 (34.2)

163 (39.7)

Monthly income

 < 4000

152 (73.8)

54 (26.3)

206 (50.1)

 ≥ 4000

54 (26.2)

151 (73.7)

205 (49.9)

 < 0.001^a

Mean (± SD)

3168 (± 2953)

4243 (± 1453)

3704 (± 2388)

 < 0.001^b

Past history of respiratory illnesses

Yes

37 (17.96)

13 (6.34)

50 (12.2)

 < 0.001^a

No

169 (82.04)

192 (93.66)

361 (87.8)