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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)