Table 1.

Age-standardized baseline characteristics according to quartiles of energy-adjusted dietary folate intake at baseline, the Swedish Mammography Cohort (1987-1990)

CharacteristicDietary folate intake (μg/d)*
<203 (n = 15,705)203-229 (n = 15,077)230-259 (n = 15,206)≥260 (n = 15,445)
Median dietary folate intake*184216244285
Mean age (y)53.253.353.754.6
Mean body mass index (kg/m2)24.724.724.724.8
Post-secondary education (%)9.211.513.716.4
Regular multivitamin use (%)13.718.720.725.7
Folic acid supplement use (%)0.80.71.01.5
Nondrinkers of alcohol (%)37.331.730.131.4
Alcohol (g/wk)§28.526.725.624.3
Median vitamin C intake (mg/d)*44.560.975.9103
Median β-carotene intake (mg/d)*1.42.22.64.2
Coffee (cups/d)2.62.42.32.2
Tea (cups/d)0.30.50.70.9
  • * Energy-adjusted to 1,700 kcal/d by using the residual method (30).

  • Information from the 1997 questionnaire.

  • The proportion of nondrinkers in the whole study population was 33%.

  • § Alcohol intake among drinkers.