Table 1

Characteristics of the study population

Risk factorCases (n = 518) n (%)Controls (n = 554) n (%)
Malea338 (65.3)370 (66.8)
Race/Ethnic group
Whiteb284 (54.8)295 (53.3)
Blackc87 (16.8)94 (17.0)
Hispanic90 (17.4)99 (17.9)
Asian57 (11.0)66 (11.9)
Smoker
Current103 (19.9)63 (11.4)
Former235 (45.4)253 (45.7)
Never180 (34.8)238 (43.0)
Physical activity >3 h/wk116 (22.4)169 (30.5)
Drink >0 g alcohol/day291 (56.2)290 (52.4)
NSAID use (some)149 (28.8)181 (32.7)
Mean (SD)Mean (SD)
Aged67.2 (6.9)67.1 (6.9)
BMI (kg/m2)e27.5 (4.5)26.9 (4.8)
Mean daily dietary intakes
Total energy (kcal)f2044 (849)1924 (812)
Total fat (g/day)72.8 (35.3)65.9 (34.3)
Saturated fat (g/day)25.0 (13.0)22.2 (12.4)
Vegetable fat (g/day)35.8 (21.1)32.6 (18.5)
Folates
Totalg (μg/day)447.8 (262.7)447.1 (260.7)
RBC (ng/ml)h261.4 (146.0)270.2 (153.2)
Plasma (ng/ml)i11.9 (8.8)13.5 (9.9)
Median (1Q–3Q)Median (1Q–3Q)
Exercise (met-hours/wk)j14.3 (9.0–29.0)18 (9.5–30.0)
Alcohol (g/day) for drinkers10.4 (2.3–26.1)6.4 (2.1–17.6)
Pack-years
Current smokers37.5 (15.5–52.5)37.0 (17.5–47.0)
Past smoker23.0 (8.0–42.0)20.0 (7.0–36.0)
  • a,b Matching factors.

  • b Includes 18 individuals who listed their race/ethnic groups as “other.”

  • c Includes three individuals who also considered themselves of Hispanic origin.

  • e n = 516 cases and 553 controls.

  • f n = 553 controls.

  • g Dietary + supplemental folate per questionnaire.

  • h n = 331 cases and 350 controls.

  • i n = 336 cases and 355 controls.

  • j Those who exercise >3 met-hours/week.