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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)