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Table 1 Age-adjusteda percent distribution of baseline characteristics

From: Recreational physical activity and risk of triple negative breast cancer in the California Teachers Study

  Overall, %
(n = 108,907)
Average annual total long-term RPA (h/wk/y), %
≤0.50(n = 9984) 0.51–2.50(n = 31,942) 2.51–4.50(n = 25,442) 4.51–7.00(n = 19,466) ≥7.01(n = 22,073)
Race
 White 86.4 80.8 85.8 88.4 87.9 87.2
 Black 2.7 4.2 3.1 2.4 2.4 2.4
 Hispanic 4.5 5.0 4.4 3.9 4.1 4.1
 Asian 3.7 7.2 4.4 3.1 2.9 2.8
 Others/unspecified 2.8 2.8 2.3 2.2 2.6 3.5
First-degree family history of breast cancer 11.7 12.7 12.5 12.0 11.5 11.3
History of a breast biopsy 15.5 17.0 17.0 15.9 15.4 14.5
Had a mammogram in the 2 years prior to baseline 74.3 84.9 83.1 80.5 77.0 73.1
BMI, kg/m2
 <25.00 (under/normal weight) 58.9 51.5 55.4 59.4 61.7 64.0
 25.00–29.99 (overweight) 23.9 25.8 24.9 24.3 23.0 21.7
 ≥30.00 (obese) 13.9 13.9 16.7 13.7 12.9 11.5
 Unknown 3.3 4.8 2.9 2.6 2.4 2.8
Nulliparous 26.7 21.7 22.2 23.6 26.5 31.3
Menopausal status and MHT use
 Premenopausal 42.6 26.4 38.5 45.6 49.1 49.7
 Peri-/postmenopausal       
  No MHT 10.6 15.1 9.7 8.3 7.9 9.1
  E only 14.4 17.6 14.0 11.4 10.8 11.3
  E plus P only 17.5 22.4 21.5 19.7 17.9 16.1
  Mixed formulations 6.5 7.9 6.4 5.6 5.3 5.0
  Unknown MHT use 4.3 6.0 4.4 3.8 3.6 3.4
 Unknown MP status 4.1 4.6 5.7 5.6 5.4 5.6
History of cigarette smoking
 Never 66.5 66.5 65.8 64.8 65.7 65.7
 Former 28.4 27.7 29.0 30.4 29.3 28.5
 Current 5.2 5.9 5.2 4.9 5.0 5.8
Alcohol intake during the year prior to baseline
 Nondrinker 31.7 40.4 33.7 29.6 28.7 28.2
 <15 g/d 47.9 41.3 47.9 50.6 50.6 50.1
 ≥15 g/d 15.9 13.4 14.7 16.4 17.1 18.0
 Unknown 4.5 4.9 3.7 3.4 3.6 3.7
  1. Abbreviations: BMI body mass index, E estrogen, g/d grams/day, h/wk/y hour/week/year, MHT menopausal hormone therapy, P progestin, RPA recreational physical activity
  2. Results are for 108,907 women aged less than 80 years in the California Teachers Study followed between 1995 and 2012
  3. aAdjusted according to the age distribution (5-year age group) of the 108,907 women who comprise the eligible cohort