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Table 1 Participant characteristics by age at thelarche among 49,686 women enrolled in the Sister Study cohort

From: Pubertal timing and breast cancer risk in the Sister Study cohort

  Age at thelarche
< 10 (N = 1743) 10–11 (N = 13,569) 12–13 (N = 25,762) > 13 (N = 8612)
  Mean SD Mean SD Mean SD Mean SD
Age at baseline, years 53.9 9.1 55.3 8.9 56.0 8.9 55.3 9.1
Bayesian family history score 0.32 0.09 0.33 0.09 0.33 0.09 0.32 0.09
Age at menarche, years 10.6 1.5 11.6 1.2 12.8 1.1 14.1 1.5
Time from thelarche to menarche, years 1.8 1.6 1.0 1.2 0.4 1.1 −0.6 1.6
Age reached adult height, years 15.0 2.9 15.5 2.5 16.3 2.2 17.2 2.1
Time from menarche to adult height, years 4.4 2.9 3.9 2.5 3.5 2.3 3.1 2.3
  n % n % n % n %
Birth cohort
 1928–1939 138 8 1432 11 3251 13 1047 12
 1940–1949 521 30 4472 33 8592 33 2602 30
 1950–1959 631 36 5052 37 9606 37 3243 38
 1960–1974 453 26 2613 19 4313 17 1720 20
Race/ethnicity
 Non-Hispanic white 1257 72 11,295 83 22,049 86 7050 82
 Non-Hispanic black 283 16 1198 9 1952 8 880 10
 Hispanic 154 9 735 5 1131 4 413 5
 Others 49 3 341 3 630 2 269 3
Family income level growing up
 Well-off 103 6 935 7 1628 6 511 6
 Middle income 952 55 8234 61 15,548 60 4940 57
 Low income 498 29 3388 25 6639 26 2362 27
 Poor 190 11 1012 7 1947 8 799 9
Relative weight to peers at age 10
 Lighter 298 17 3234 24 9197 36 4661 54
 Same 700 40 6616 49 12,595 49 3255 38
 Heavier 744 43 3693 27 3895 15 674 8
 Missing 1   26   75   22  
Relative height to peers at age 10
 Shorter 332 19 2880 21 6612 26 2867 33
 Same 649 37 6071 45 12,424 48 3633 42
 Taller 760 44 4600 34 6687 26 2107 25
 Missing 2   18   39   5  
  1. Column percentages are displayed. Missing data are excluded from percentages. Percentages may not add up to 100 due to rounding