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. 2021 Jun 26;21:265. doi: 10.1186/s12886-021-02025-y

Table 1.

Socio-demographic characteristics of street sweepers and office cleaners in the study of dry eye disease amongst outdoor street sweepers and indoor office cleaners

Variables Street Sweepers
(n = 115)
Freq. (%)
Office Cleaners
(n = 115)
Freq. (%)
Total
(N = 230)
Freq. (%)
p- value
Age (years)
  < =20 1 (0.9) 1 (0.9) 2 (0.9) 0.267
 21–30 14 (12.2) 21 (18.3) 35 (15.2)
 31–40 44 (38.3) 37 (32.2) 81 (35.2)
 41–50 34 (29.6) 38 (33.0) 72 (31.3)
 51–60 19 (16.5) 18 (15.7) 37 (16.0)
  > 60 3 (2.6) 0 (0.0) 3 (1.3)
Mean Age ± SD 41.78 ± 10.39 40.26 ± 9.46

40.96 ± 9.8

±10.8

0.155
Sex
 Male 3 (2.6) 12 (10.4) 15 (6.5) 0.016*
 Female 112 (97.4) 103 (89.6) 215 (93.5)
Level of education
 None 3 (2.6) 1 (0.9) 4 (1.7) < 0.047*
 Primary 40 (34.8) 29 (25.2) 69 (30.0)
 Secondary 57 (49.6) 55 (47.8) 112 (48.7
 Tertiary 15 (13.0) 30 (26.1) 45 (19.6)
Duration of years on the job
 1–5 years 46 (40.0) 45 (39.1) 93 (38.60) < 0.001*
 6–10 years 31 (27.0 32 (27.8) 69 (28.6)
 11–15 years 24 (20.9) 9 (7.8) 35 (14.5)
 16–20 years 13 (11.3) 10 (8.7) 25 (10.0)
 21–25 years 0 (0) 5 (4.3)
 26-30 years 1 (0.9) 9 (7.8)
  > 30 years 0 (0.0) 5 (4.3) 21 (8.3)