Table 1

Characteristics of participants according to antibiotic use at age 20–39, Nurses’ Health Study 2004

None<15 days15 days to 2 months2 months+
Age, years*71.9 (6.2)68.9 (5.8)68.0 (5.5)67.2 (5.1)
Family history of cancer, %21191820
History of diabetes, %8.18.79.58.8
Height, cm164 (6)164 (6)164 (6)164 (6)
Body mass index, kg/m²25.4 (4.2)25.6 (4.4)25.7 (4.4)25.4 (4.4)
Current hormone therapy use, %16192125
Current endoscopy due to symptoms, %15192125
Number of previous endoscopies2.8 (1.7)3.0 (1.8)3.0 (1.8)3.1 (1.8)
Regular use of aspirin, %39424547
Current use of multivitamin, %74777979
Physical activity, MET-hours/week19.9 (16.3)18.9 (16.4)18.0 (15.8)19.4 (16.8)
Pack-years among ever-smokers18.8 (18.7)21.1 (19.3)19.0 (17.5)18.5 (17.7)
Alcohol intake, g/day2.4 (1.0)2.3 (0.9)2.3 (0.9)2.3 (0.9)
Total calorie intake, kcal/day1674 (380)1708 (400)1774 (404)1809 (410)
Folate intake, μg/day492 (160)499 (170)500 (166)530 (175)
Calcium intake, mg/day1103 (337)1095 (345)1110 (327)1159 (358)
Red meat intake, servings/week5.4 (2.5)5.6 (2.7)5.9 (2.7)5.8 (2.7)
Alternate Healthy Eating Index 2010†48.8 (8.6)48.6 (8.6)47.8 (8.9)48.8 (9.3)
  • *All values other than age have been directly standardised to age distribution (in 5-year age group) of all the participants. Mean (SD) was presented for continuous variables.

  • †Without alcohol intake.

  • MET, metabolic equivalent task.