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Table 2 Baseline characteristics of study cohort, by quintile of propensity score

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

Quintile   1    2    3    4    5  
  HD PD p HD PD p HD PD p HD PD p HD PD p
N 3,046 295   2,643 691   2,157 1,127   1,813 1,548   1,182 2,141  
(%) (91.2) (8.8)   (79.3) (20.7)   (65.7) (34.3)   (53.9) (46.1)   (35.6) (64.4)  
Age (yr) 72.5 72.2 0.66 65.0 65.7 0.16 59.0 58.6 0.38 52.7 52.5 0.19 46.6 45.2 0.003
Male gender (%) 49.0 50.2 0.71 58.2 58.5 0.90 62.8 62.6 0.92 61.0 61.0 0.98 63.0 63.1 0.95
Primary renal disease (%)    0.27    0.74    0.89    0.37    0.08
GN 7.4 4.4   7.3 6.1   11.1 11.4   12.3 14.5   27.3 31.2  
HT 11.2 12.9   12.4 11.7   12.1 11.8   13.0 12.9   8.8 8.2  
RVD 13.0 14.2   11.8 12.7   9.6 8.5   6.5 6.3   3.2 2.7  
DM 14.0 15.9   14.7 14.5   15.4 16.0   14.3 13.0   17.3 18.6  
Other 54.5 52.5   53.8 55.0   51.9 52.4   53.9 53.3   43.3 39.3  
Year of first RRT (%)    0.34    0.001    0.40    0.76    0.011
1987-1990 19.4 16.6   19.4 13.0   18.6 16.7   16.7 14.4   12.4 14.8  
1991-1994 24.1 27.1   24.3 27.5   24.2 26.3   22.1 25.1   18.0 20.6  
1995-1998 28.5 25.8   28.1 30.1   28.0 27.3   27.6 28.5   30.3 30.5  
1999-2002 28.0 30.5   28.2 29.4   29.2 29.7   33.6 32.0   39.3 34.1  
  1. N = number of patients, yr = year, GN = glomerulonephritis, HT = hypertension, RVD = renovascular disease, DM = diabetes mellitus, RRT = renal replacement therapy, HD = hemodialysis, PD = peritoneal dialysis, p = p-value