Table 1.
Baseline Characteristics in Each Analytic Subcohort of Girls Assessed Before the Onset of the Development of Pubertal Characteristics, the Lessons in Epidemiology and Genetics of Adult Cancer From Youth Girls Study (n = 1,040), 2011–2016
| Characteristic | Breast Development (n = 447) | Pubic Hair Development (n = 456) | Menarche (n = 681) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| No. | % | Mean (SD) | No. | % | Mean (SD) | No. | % | Mean (SD) | |
| Race/ethnicity | |||||||||
| Non-Hispanic White | 316 | 70.7 | 326 | 71.5 | 469 | 68.9 | |||
| Other | 131 | 29.3 | 130 | 28.5 | 212 | 31.1 | |||
| Study center | |||||||||
| Philadelphia, PA | 66 | 14.8 | 68 | 14.9 | 110 | 16.2 | |||
| New York, NY | 78 | 17.5 | 76 | 16.7 | 112 | 16.5 | |||
| Salt Lake City, UT | 89 | 19.9 | 88 | 19.3 | 118 | 17.3 | |||
| Toronto, ON, Canada | 76 | 17.0 | 82 | 18.0 | 117 | 17.2 | |||
| San Francisco Bay area, CA | 138 | 30.9 | 142 | 31.1 | 224 | 32.9 | |||
| Maternal education | |||||||||
| Some college or less | 93 | 20.8 | 99 | 21.7 | 151 | 22.2 | |||
| Bachelor’s degree | 179 | 40.0 | 182 | 39.9 | 261 | 38.3 | |||
| Graduate degree | 170 | 38.0 | 170 | 37.3 | 263 | 38.6 | |||
| Missing | 5 | 1.1 | 5 | 1.1 | 6 | 0.9 | |||
| Breast cancer family history | |||||||||
| None | 235 | 52.6 | 228 | 50.0 | 349 | 51.3 | |||
| Second degree only | 133 | 29.8 | 148 | 32.5 | 206 | 30.3 | |||
| First degree | 79 | 17.7 | 80 | 17.5 | 126 | 18.5 | |||
| Daughter’s age at behavioral assessment, years | 8.6 (1.6) | 8.6 (1.5) | 9.4 (1.9) | ||||||
| Body mass index percentile | 41.0 (28.2) | 44.3 (29.5) | 45.4 (29.7) | ||||||
| Maternal-reported internalizing symptoms in girlsa | |||||||||
| Anxiety | 45.9 (28.9) | 45.4 (29.1) | 46.9 (29.3) | ||||||
| Depression | 53.3 (27.3) | 52.6 (27.3) | 52.5 (26.9) | ||||||
| Somatization | 46.4 (30.9) | 46.4 (30.7) | 46.6 (31.0) | ||||||
| Internalizing | 47.5 (29.4) | 47.1 (29.7) | 47.9 (29.4) | ||||||
| Maternal self-reported internalizing symptoms | |||||||||
| Stressb | 4.8 (2.7) | 4.9 (2.7) | 4.8 (2.7) | ||||||
| Anxietyc | 7.0 (3.6) | 7.0 (3.7) | 6.9 (3.7) | ||||||
| Depressionc | 3.3 (2.7) | 3.4 (2.8) | 3.2 (2.8) | ||||||
| Family communicationd | 17.9 (3.8) | 18.1 (3.6) | 18.0 (3.8) | ||||||
| Family functioningd | 21.4 (5.3) | 21.7 (5.2) | 21.4 (5.3) | ||||||
Abbreviations: CA, California; NY, New York; ON, Ontario; PA, Pennsylvania; SD, standard deviation; UT, Utah.
a Anxiety, depression, and somatization data from the internalizing subscales of the Behavior Assessment System for Children-2 (percentiles). Internalizing is a composite of the other scales.
b Perceived Stress Scale score.
c Hospital Anxiety and Depression Scales scores.
d General function and communication subscales of the McMaster Family Assessment Device.