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Table 1 Characteristics of participating girls, by pubertal outcomes; the LEGACY Girls Study

From: Pubertal development in girls by breast cancer family history: the LEGACY girls cohort

Category

Entire cohort (n = 1040)

Breast Tanner, girls aged <13 (n = 801)

Pubic hair Tanner, girls aged <13 (n = 835)

Menarche, girls ≥10 (n = 506)

Stage T1

(n = 506)

Stage T2+

(n = 295)

Stage T1

(n = 556)

Stage T2+

(n = 279)

No menses

(n = 313)

Menses

(n = 193)

Continuous variables, mean (SD)

 Age (years)

10.1 (2.4)

8.7 (1.7)

11.2 (1.3)

8.7 (1.7)

11.2 (1.4)

11.4 (1.0)

13.2 (1.2)

 Weight (kg)

37.8 (14.6)

29.6 (8.4)

46.0 (12.4)

30.1 (9.4)

44.7 (13.2)

41.1 (10.8)

55.5 (13.1)

 Height (cm)

142.6 (15.3)

133.5 (11.0)

151.8 (10.7)

133.4 (11.1)

151.2 (11.1)

149.9 (9.2)

161.2 (7.5)

 BMI (kg/m2)

18.0 (4.3)

16.4 (3.4)

19.8 (4.3)

16.7 (3.7)

19.3 (4.3)

18.2 (3.8)

21.3 (4.3)

 Maternal age at menarche

12.7 (1.5)

12.9 (1.5)

12.4 (1.5)

12.8 (1.5)

12.6 (1.5)

12.9 (1.5)

12.4 (1.5)

 Maternal age at daughter’s birth

32.3 (5.5)

32.6 (5.4)

31.8 (5.7)

32.5 (5.4)

32.0 (5.7)

32.4 (5.2)

31.2 (5.8)

Categorical variables, count (%)

 Overweight

   ≥ 85th percentile

193 (18.6)

60 (11.9)

90 (30.5)

81 (14.6)

71 (25.5)

46 (14.7)

55 (28.5)

 Race/ethnicity

  Hispanic

193 (18.6)

79 (15.6)

60 (20.3)

88 (15.8)

60 (21.5)

44 (14.1)

58 (30.1)

  Black

78 (7.5)

27 (5.3)

34 (11.5)

27 (4.9)

36 (12.9)

22 (7.0)

17 (8.8)

  Non-hispanic white

646 (62.1)

343 (67.8)

172 (58.3)

371 (66.7)

160 (57.4)

209 (66.8)

91 (47.2)

  Asian

93 (8.9)

46 (9.1)

19 (6.4)

55 (9.9)

16 (5.7)

31 (9.9)

19 (9.4)

  Mixed race/ethnicity

30 (2.9)

11 (2.2)

10 (3.4)

15 (2.7)

7 (2.5)

7 (2.2)

8 (4.2)

 Study site

 

  Philadelphia

154 (14.8)

72 (14.2)

53 (18.0)

74 (13.3)

52 (18.6)

63 (20.1)

25 (13.0)

  Utah

164 (15.8)

86 (17.0)

32 (10.9)

100 (18.0)

30 (10.8)

45 (14.4)

16 (8.3)

  New York

168 (16.2)

95 (18.8)

45 (15.2)

102 (18.4)

38 (13.6)

39 (12.5)

28 (14.5)

  Ontario, Canada

192 (18.5)

103 (20.4)

53 (18.0)

113 (20.3)

49 (17.6)

53 (16.9)

37 (19.2)

  San Francisco Bay Area

362 (34.8)

150 (29.6)

112 (38.0)

167 (30.0)

110 (39.4)

113 (36.1)

87 (45.1)

 Maternal education

  Some college/vocational/technical school or less

284 (27.3)

114 (22.5)

101 (35.1)

139 (25.0)

85 (30.5)

77 (24.6)

73 (37.8)

  Bachelor’s degree

377 (36.3)

194 (38.3)

85 (29.5)

210 (37.8)

90 (32.3)

107 (34.2)

62 (32.1)

  Graduate degree

353 (33.9)

191 (37.8)

102 (35.4)

199 (35.8)

98 (35.1)

124 (39.6)

45 (23.3)

 Breast cancer family history (BCFH)

  No BCFH

497 (47.8)

267 (52.7)

142 (48.1)

277 (49.8)

146 (52.3)

154 (49.2)

84 (43.5)

  Any BCFH

533 (51.3)

239 (47.2)

153 (51.9)

279 (50.2)

133 (47.7)

159 (50.8)

109 (56.5)

  First-degree BCFH

219 (21.1)

89 (17.6)

64 (21.7)

99 (17.8)

63 (22.6)

71 (22.7)

53 (27.5)

  Second-degree BCFH Only

313 (30.1)

150 (29.6)

89 (30.2)

180 (32.4)

70 (25.1)

88 (28.1)

56 (29.0)

  1. BMI body mass index, SD standard deviation.