Table 1.

Characteristics of the study population.

	Case (n=761)	Control (n=910)
Age (years)
Mean (SD)	67.7 (10.6)	65.8 (11.6)
Sex
Male	486 (63.9%)	430 (47.3%)
Female	275 (36.1%)	480 (52.7%)
Race/Ethnicity
White	587 (77.1%)	607 (66.7%)
Latino	125 (16.4%)	197 (21.6%)
Asian	18 (2.4%)	28 (3.1%)
African American	4 (0.5%)	31 (3.4%)
Others	27 (3.5%)	47 (5.2%)
Education (years)
Mean (SD)	13.6 (4.4)	13.6 (4.3)
Smoking status
Never	413 (54.3%)	438 (48.1%)
Former	321 (42.2%)	360 (39.6%)
Current	27 (3.5%)	112 (12.3%)
study wave
PEG1	337 (44.3%)	371 (40.8%)
PEG2	424 (55.7%)	539 (59.2%)