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Table 1 Socio-demographic characteristics of the study population by study area

From: Prevalence and risk factors for impaired kidney function in the district of Anuradhapura, Sri Lanka: a cross-sectional population-representative survey in those at risk of chronic kidney disease of unknown aetiology

Socio-demographic characteristics Area 1
(n = 908)
Area 2
(n = 1008)
Area 3
(n = 926)
Area 4
(n = 1000)
Area 5
(n = 961)
Total
(n = 4803)
n (%) n (%) n (%) n (%) n (%) n (%)
Age-group (years) (n = 4803)
  < 25 63 (6.9) 82 (8.1) 69 (7.5) 68 (6.8) 58 (6.0) 340 (7.1)
 25–34 144 (15.9) 167 (16.6) 153 (16.5) 173 (17.3) 154 (16.0) 791 (16.5)
 35–44 214 (23.6) 265 (26.3) 243 (26.2) 235 (23.5) 279 (29.0) 1236 (25.7)
 45–54 161 (17.7) 216 (21.4) 188 (20.3) 212 (21.2) 200 (20.8) 977 (20.3)
 55–64 181 (19.9) 165 (16.4) 161 (17.4) 180 (18.0) 166 (17.3) 853 (17.8)
 65–70 92 (10.1) 75 (7.4) 63 (6.8) 75 (7.5) 70 (7.3) 375 (7.8)
  > 70 53 (5.8) 38 (3.8) 49 (5.3) 57 (5.7) 34 (3.5) 231 (4.8)
Sex (n = 4803)
 Male 290 (31.9) 340 (33.7) 313 (33.8) 300 (30.0) 286 (29.8) 1529 (31.8)
 Female 618 (68.1) 668 (66.3) 613 (66.2) 700 (70.0) 675 (70.2) 3274 (68.2)
Years of education in schools and in higher education institutes (n = 4803)
 No schooling 70 (7.7) 40 (4.0) 62 (6.7) 34 (3.4) 32 (3.3) 238 (5.0)
   < 10 302 (33.3) 336 (33.3) 310 (33.5) 361 (36.1) 341 (35.5) 1650 (34.4)
   ≥ 10 536 (59.0) 632 (62.7) 554 (59.8) 605 (60.5) 588 (61.2) 2915 (60.7)
Ever occupied in farming (n = 4803)
 Full time farming 444 (48.9) 391 (38.8) 435 (47.0) 482 (48.2) 486 (50.6) 2238 (46.6)
  Male 131 (45.2) 124 (36.5) 149 (47.6) 125 (41.7) 122 (42.7) 651 (42.6)
  Female 313 (50.6) 267 (40.0) 286 (46.7) 357 (51.0) 364 (53.9) 1587 (48.5)
 Part time farming 299 (32.9) 295 (29.3) 255 (27.5) 280 (28.0) 248 (25.8) 1377 (28.7)
  Male 123 (42.4) 147 (43.2) 122 (39.0) 140 (46.7) 127 (44.4) 659 (43.1)
  Female 176 (28.5) 148 (22.2) 133 (21.7) 140 (20.0) 121 (17.9) 718 (21.9)
 No 165 (18.2) 322 (31.9) 236 (25.5) 238 (23.8) 227 (23.6) 1188 (24.7)
  Male 36 (12.4) 69 (20.3) 42 (13.4) 35 (11.7) 37 (12.9) 219 (14.3)
  Female 129 (20.9) 253 (37.9) 194 (31.6) 203 (29.0) 190 (28.1) 969 (29.6)