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Table 1 Selected participant characteristics in 1998, the midpoint during follow-up, by quintiles of AHEI-2010 score among women in the NHS

From: A prospective cohort study of dietary indices and incidence of epithelial ovarian cancer

  Quintiles of AHEI-2010 score
  ≤42 (N = 11255) >42-48 (N = 12518) >48-53 (N = 13169) >53-59 (N = 13417) >59 (N = 13273)
Mean (SD)      
Age, years* 62.4 (7.1) 63.4 (7.1) 64.1 (7.1) 64.8 (7.1) 65.6 (7.0)
Age at menarche, years* 12.6 (1.4) 12.6 (1.4) 12.5 (1.4) 12.5 (1.4) 12.5 (1.4)
BMI, kg/m2 27.0 (5.5) 26.8 (5.2) 26.7 (5.2) 26.5 (5.0) 26.0 (4.9)
Years of OC usea 4.4 (3.8) 4.3 (3.8) 4.2 (3.9) 4.1 (3.9) 4.1 (4.0)
Parityb 3.3 (1.6) 3.3 (1.6) 3.2 (1.5) 3.2 (1.5) 3.1 (1.4)
Physical activity, MET-hr/wk 12.5 (17.4) 14.9 (18.3) 17.2 (21.6) 18.9 (21.6) 23.8 (27.0)
Lactose intake, mg/day 12.7 (9.6) 13.2 (9.1) 13.6 (9.2) 14 (9.3) 13.9 (9.0)
Caffeine intake, mg/day 287.9 (201.6) 291.6 (202.0) 285.5 (199.4) 278.9 (198.8) 259.7 (198.3)
Calories per day 1859 (451) 1777 (460) 1739 (465) 1705 (468) 1684 (461)
Pack-years of smokingc 31.8 (24.5) 27.6 (22.6) 25.3 (21.3) 22.7 (20.0) 20.5 (18.4)
E only HT use, yearsd 6.0 (5.6) 6.0 (5.7) 6.4 (6.0) 6.4 (5.8) 6.6 (5.9)
E + P HT use, yearse 5.0 (3.2) 5.0 (3.3) 5.2 (3.3) 5.2 (3.4) 5.3 (3.5)
Other HT use, yearsf 3.0 (2.9) 2.9 (2.8) 3.0 (2.7) 3.0 (2.6) 3.1 (2.7)
Percent      
Ever OC use 49 49 51 51 52
Smoking status      
Never 47 45 44 42 40
Past 36 41 43 47 53
Current 17 14 12 10 7
Parous 95 95 95 94 93
Family history of ovarian cancer 3 3 3 3 3
Tubal ligation 21 21 21 21 21
Hysterectomy      
No 73 75 74 75 74
Yes 22 21 23 22 22
Unknown 5 4 3 3 3
Unilateral oophorectomy      
No 85 87 86 87 87
Yes 9 8 9 9 8
Unknown 6 5 4 4 4
Postmenopausal 92 92 93 93 92
Ever E only HT use 22 23 25 25 27
Ever E + P HT use 26 29 32 33 36
Ever other HT use 18 20 21 22 25
  1. Values are standardized to the age distribution of the study population. Values of polytomous variables may not sum to 100% due to rounding.
  2. aAmong ever OC users.
  3. bAmong parous women.
  4. cAmong ever smokers.
  5. dAmong E only HT ever users.
  6. eAmong E + P HT ever users.
  7. fAmong other HT ever users.
  8. *Value is not age adjusted.