Table 2—

Baseline coffee consumption by baseline glucose level in nondiabetic participants, Rancho Bernardo Study, 1984–1987

CharacteristicTotal nondiabeticNormal glucose*Impaired glucose*
n910593317
Coffee status
    Never drank97 (10.7)58 (9.8)39 (12.3)
    Past drinker153 (16.8)93 (15.7)60 (18.9)
    Current drinker660 (72.5)442 (74.5)218 (68.8)
Daily coffee consumption after age 45 years (cups)
    0250 (27.5)151 (25.5)99 (31.2)
    1–2379 (41.7)246 (41.5)133 (42.0)
    3–4183 (20.1)124 (20.9)59 (18.6)
    ≥598 (10.8)72 (12.1)26 (8.2)
Cup-years101.0 (98.0)102.0 (98.5)95.0 (100.0)
  • Data are n (%) or median (interquartile range).

  • *

    * Normal glucose defined as FPG <6.1 mmol/l and PCG <7.8 mmol/l or missing PCG. Impaired glucose defined as either impaired fasting glucose (6.1 mmol/l ≤ FPG < 7.0 mmol/l and PCG < 7.8 mmol/l) or impaired glucose tolerance (FPG < 6.1 mmol/l and 7.8 mmol/l ≤ PCG < 11.1 mmol/l). †Because of the missing coffee drinking start date, cup-years were based on sample sizes of 815, 536, and 279 for the total nondiabetic sample, those with normal glucose at baseline, and those with impaired glucose at baseline, respectively.