Table 1

Demographic characteristics and HOUSES index overall and by quartiles in study participants

VariableOverall (N=6402)Quartilep Value*
First (n=1600)Second (n=1587)Third (n=1622)Fourth (n=1593)
Age, median (25th, 75th), years57 (45, 68)57 (38, 71)61 (47, 72)58 (48, 71)54 (45, 63)<0.001
Age >75 years, N (%)743 (11.6)244 (15.3)225 (14.2)211 (13.0)63 (4.0)<0.001
Male sex, N (%)2153 (37.5)444 (30.2)533 (35.1)622 (40.5)554 (36.9)<0.001
White race/ethnicity, %94.691.896.595.894.3<0.001
Education level, %<0.001
 High school or less16.225.319.914.45.4
 Some college33.939.237.734.724.0
 Bachelor degree27.621.225.629.234.2
 Graduate school22.314.216.921.836.3
  • *The comparisons are of each of the four quartiles with the demographic variable.

  • HOUSES, housing-based socioeconomic status.