Table 1.

Baseline characteristics of study population by MetS classification

Characteristics*MetS
Men (n = 1,609)
Women (n = 783)
No (n = 937)Yes (n = 672)No (n = 506)Yes (n = 277)
Demographics
    Age, y66.1 ± 8.965.8 ± 8.265.1 ± 9.466.7 ± 7.8
    White (ethnicity/race)894 (95.8)624 (94.4)482 (95.8)261 (94.6)
    Education, y14.1 ± 2.513.9 ± 2.313.4 ± 2.213.0 ± 2.1
Dietary intake
    Energy, kcal/d2,095.6 ± 749.42,209.9 ± 773.21,552.6 ± 577.01,593.2 ± 614.7
    Protein, g/d76.9 ± 28.282.6 ± 29.258.4 ± 21.062.4 ± 27.6
    Carbohydrates, g/d281.9 ± 111.5300.1 ± 119.0222.7 ± 91.8223.2 ± 94.1
    Total dietary fiber, g/d22.9 ± 10.124.1 ± 10.819.2 ± 8.919.7 ± 10.5
    Total fat, g/d71.2 ± 31.474.8 ± 31.950.2 ± 24.253.3 ± 25.8
    Calcium, mg/day968.8 ± 443.31,038.0 ± 446.7834.7 ± 399.5876.5 ± 461.2
    Red meat, g/d61.8 ± 41.767.4 ± 44.533.6 ± 24.342.6 ± 34.7
    Alcohol, g/d10.6 ± 18.09.1 ± 16.23.6 ± 6.32.8 ± 5.5
Nondietary factors
    Smoking status
        Never237 (25.5)171 (25.8)240 (47.7)110 (47.4)
        Former578 (62.3)415 (62.5)175 (34.8)109 (39.9)
        Current113 (12.2)78 (11.7)88 (17.5)34 (12.5)
    BMI26.5 ± 3.430.3 ± 4.225.2 ± 4.330.6 ± 5.4
    Waist-to-hip ratio0.93 ± 0.050.97 ± 0.050.79 ± 0.080.86 ± 0.07
    Diabetes (self-reported)50 (5.4)107 (16.3)10 (2.0)46 (16.7)
    Aspirin use283 (30.2)230 (34.2)102 (20.2)53 (19.1)
    Previous polyps§372 (43.0)281 (45.5)178 (39.3)101 (40.2)
    Family history of colorectal cancer186 (20.7)138 (21.2)122 (25.3)70 (26.2)
Adenoma characteristics
    Size of largest adenoma, mm8.5 ± 5.78.3 ± 5.38.7 ± 6.49.1 ± 5.8
    No. adenomas1.8 ± 1.31.8 ± 1.61.5 ± 1.11.7 ± 1.0
    Proximal adenomas457 (50.6)379 (57.8)213 (44.1)135 (50.2)
    Tubulovillous/villous186 (19.9)141 (21.0)107 (21.2)71 (25.6)
  • * Count and percentage for categorical variables; mean ± SD for continuous variables.

  • Participants with missing data: education 21, BMI 18, size of largest adenoma 1, number of adenomas 5, White 19, smoking status 24, diabetes 35, previous polyps 205, family history of colorectal cancer 93, proximal adenomas 81, and tubulovillous/villous histology 2.

  • Regular use of aspirin in the previous month.

  • § History of previous polyps before qualifying colonoscopy.

  • History of colorectal cancer in parent or sibling.