Table 1.

Baseline characteristics by quartile of energy-adjusted intake of total dietary fiber among 16,636 men and 26,479 women in the JACC Study, 1988 to 1997

Quartiles of energy-adjusted intake of total dietary fiber
1234
Men
n4,1594,1594,1594,159
Intake of total dietary fiber (g/day)6.7 ± 2.09.4 ± 2.111.3 ± 2.613.4 ± 3.0
Age (y)53.6 ± 9.455.3 ± 9.756.8 ± 10.059.7 ± 10.3
Education beyond high school (%)18.119.021.323.1
Family history of colorectal cancer in parents and/or siblings (%)2.12.72.52.4
Alcohol consumption
    Current drinkers (%)84.079.074.859.8
    Former drinkers (%)3.04.06.712.1
Smoking
        Current smokers (%)59.353.851.244.6
    Former smokers (%)24.627.227.129.8
BMI (kg/m2)22.7 ± 2.722.8 ± 3.922.7 ± 2.722.6 ± 2.9
Walking time >30 min/day (%)64.368.171.770.2
Exercise ≥1 h a week (%)27.630.733.637.8
Sedentary work (%)27.931.533.936.2
Consumption of beef ≥3 times a week (%)8.86.86.66.0
Consumption of pork ≥3 times a week (%)13.619.724.825.6
Energy intake (kcal/day)1,658 ± 4601,744 ± 4521,745 ± 4731,614 ± 443
Folate intake (μg/day)302 ± 131380 ± 138439 ± 151500 ± 158
Calcium intake (mg/day)391 ± 144480 ± 147543 ± 156598 ± 165
Vitamin D intake (μg/day)6.0 ± 3.27.2 ± 3.48.2 ± 3.68.9 ± 3.8
Women
n6,6196,6206,6206,620
Intake of total dietary fiber (g/day)7.4 ± 2.19.8 ± 2.111.5 ± 2.213.4 ± 2.8
Age (y)54.7 ± 9.655.9 ± 9.756.8 ± 9.959.3 ± 9.9
Education beyond high school (%)9.911.312.112.4
Family history of colorectal cancer in parents and/or siblings (%)2.52.83.02.9
Alcohol consumption
    Current drinkers (%)29.626.222.119.1
    Former drinkers (%)1.71.61.71.7
Smoking
    Current smokers (%)7.84.83.73.9
    Former smokers (%)1.71.41.41.6
BMI (kg/m2)22.9 ± 3.122.7 ± 3.022.9 ± 3.622.8 ± 3.1
Walking time >30 min/day (%)68.771.673.773.7
Exercise ≥1 h a week (%)19.522.825.127.7
Sedentary work (%)31.134.736.738.1
Consumption of beef ≥3 times a week (%)11.811.08.66.0
Consumption of pork ≥3 times a week (%)17.121.824.021.6
Energy intake (kcal/day)1,391 ± 3731,432 ± 3451,438 ± 3201,381 ± 333
Folate intake (μg/day)321 ± 137390 ± 141435 ± 145487 ± 155
Calcium intake (mg/day)423 ± 151504 ± 154555 ± 158586 ± 166
Vitamin D intake (μg/day)6.2 ± 3.27.4 ± 3.48.2 ± 3.58.9 ± 3.9
  • NOTE: Plus-minus values are means ± SD.