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Table 1 Baseline characteristics of study cohort

From: Propensity scores in the presence of effect modification: A case study using the comparison of mortality on hemodialysis versus peritoneal dialysis

  All patients HD PD P-value
Number (%) 16,643   10,841 (65.1) 5,802 (34.9)  
Age (SD) (yr) 59.0 (15.3) 61.8 (14.6) 53.6 (15.0) <0.001
Female gender (%) 41.2   42.5   38.7   <0.001
Primary renal disease (%)        <0.001
GN 13.7   11.1   18.5   
HT 11.4   11.7   10.8   
RVD 8.7   9.8   6.6   
DM 15.2   14.9   16.0   
Other 51.0   52.5   48.1   
Year of first RRT (%)        <0.001
1987-1990 17.0   18.0   14.9   
1991-1994 23.5   23.2   24.0   
1995-1998 28.6   28.3   29.0   
1999-2002 31.0   30.5   32.0   
Years of follow-up (SD) 2.38 (2.14) 2.42 (2.24) 2.32 (1.95) 0.007
  1. SD = standard deviation, yr = year, GN = glomerulonephritis, HT = hypertension, RVD = renovascular disease, DM = diabetes mellitus, RRT = renal replacement therapy, HD = hemodialysis, PD = peritoneal dialysis