Table 1 The characteristics of the study population

Age (years)^b

49 ± 15.8

Gender^a

 Male

1004 (63.4 %)

 Female

579 (36.6 %)

Occupation^a

 Unemployed

1208 (76.3 %)

 Non professional

238 (15.0 %)

 Professional

137 (8.4 %)

Origin^a

 Northern Sudan

438 (27.7 %)

 Central Sudan

417 (26.3 %)

 Western Sudan (Kordofan)

270 (17.1 %)

 Western Sudan (Darfour)

144 (9.1 %)

 Eastern Sudan

53 (3.3 %)

 Khartoum

261 (16.5 %)

Address^a

 Khartoum

624 (39.4 %)

 Omdurman

547 (34.6 %)

 Khartoum North

230 (14.5 %)

 East Nile

147 (9.3 %)

 Outside Khartoum

35 (2.2 %)

Duration of haemodialysis (years)^b

4.38 ± 4.24