AA group 43 B Bgroup 42 P values
Sex (male/female) 22/21 29/13 0.0924
Age (years) 67.6±13.1 68.3±12.8 0.6827
  DM 17(51.5%) 17(48.6%) 0.9374
CGN 4(12.1%) 5(14.3%)
Nephrosclerosis 5(15.2%) 4(11.4%)
others 7(21.2%) 9(25.7%)
DM: diabetes mellitus, CGN: chronic glomerulonephritis; () indicates percentage. AA group: patients originated from A group and the levels of Hb was not out of the initially determined range. BB group: patients originated from Bgroup and the levels of Hb was not out of the initially determined range.
Table 3: Basic Characteristics of eligible patients.