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Table 1 Characteristics of the study population

From: Computer vision syndrome among computer office workers in a developing country: an evaluation of prevalence and risk factors

 

All

Males

Females

Province (number requireda)

 Western (1100)

1116 (50.5 %)

548 (48.8 %)

568 (52.2 %)

 Central (240)

280 (12.7 %)

92 (8.2 %)

188 (17.3 %)

 Sabaragamuwa (140)

170 (7.7 %)

90 (8.1 %)

80 (7.4 %)

 North-Western (160)

164 (7.4 %)

80 (7.1 %)

84 (7.7 %)

 Southern (160)

162 (7.3 %)

82 (7.3 %)

80 (7.4 %)

 Eastern (80)

84 (3.8 %)

76 (6.8 %)

8 (0.7 %)

 Northern (70)

84 (3.8 %)

76 (6.8 %)

8 (0.7 %)

 North-Central (80)

82 (3.7 %)

42 (3.7 %)

40 (3.7 %)

 Uva (60)

68 (3.1 %)

36 (3.2 %)

32 (2.9 %)

Age

 <20 years

100 (4.5 %)

26 (2.3 %)

74 (6.8 %)

 20–29 years

1062 (48.0 %)

522 (46.5 %)

540 (49.6 %)

 30–39 years

740 (33.5 %)

400 (35.7 %)

340 (31.3 %)

 ≥40 years

308 (13.9 %)

174 (15.5 %)

134 (12.3 %)

Number of working years in current position

 1–5 years

1670 (75.6 %)

846 (75.4 %)

824 (75.7 %)

 6–10 years

210 (9.5 %)

116 (10.3 %)

94 (8.6 %)

 11–15 years

192 (8.7 %)

84 (7.5 %)

108 (10.0 %)

 15 years and more

138 (6.2 %)

76 (6.8 %)

62 (5.7 %)

Number of working hours with computer/day

 2–5 h

532 (24.1 %)

230 (20.5 %)

302 (27.8 %)

 6–9 h

978 (44.2 %)

512 (45.6 %)

466 (42.8 %)

 >9 h

700 (31.7 %)

380 (33.9 %)

320 (29.4 %)

  1. aNumber required from each province, based on percentage computer usage in each province and total provincial population (PPS method)