Table 1.

Characteristics of DISC intervention and usual care group participants at DISC06 follow-up visits

CharacteristicsIntervention group (n = 118)Usual care group (n = 112)P*
Continuous variablesMean ± SDMean ± SD
Age at visit (y)27.3 ± 1.027.2 ± 1.10.46
Age at randomization (y)9.2 ± 0.69.2 ± 0.60.67
Height (cm)165.1 ± 6.3165.2 ± 6.10.90
Weight (kg)69.5 ± 16.168.3 ± 15.00.54
BMI at visit (kg/m2)25.5 ± 5.725.0 ± 5.00.45
BMI at baseline (Z-score)0.2 ± 0.90.2 ± 0.90.84
Age at menarche (y)12.9 ± 1.212.9 ± 1.20.83
No. full-term pregnancies (n = 57)1.7 ± 1.01.4 ± 0.60.17
Age at first full-term pregnancy (n = 57)22.9 ± 3.222.7 ± 2.80.84
Duration breast-fed, wk (n = 49)29.4 ± 29.739.0 ± 31.50.27
Duration hormonal contraceptive use (y)5.5 ± 3.75.0 ± 3.60.41
Categorical variablesn (%)n (%)P
Race0.58
    White109 (92.4)99 (88.4)
    Black6 (5.1)8 (7.1)
    Other3 (2.5)5 (4.5)
Education0.19
    High school6 (5.1)8 (7.1)
    Vocational or technical school5 (4.2)6 (5.4)
    Some college32 (27.1)17 (15.2)
    Bachelor's degree54 (45.8)64 (57.1)
    Graduate degree21 (17.8)17 (15.2)
Marital status0.47
    Single61 (51.7)65 (58.0)
    Married or living as married51 (43.2)44 (39.3)
    Separated or divorced6 (5.1)3 (2.7)
Ever full-term pregnancy27 (22.9)30 (26.8)0.49
Ever breast-fed25 (21.2)24 (21.4)0.96
Menstrual cycle phase at visit0.70
    Luteal (1-14 d before menses)99 (83.9)90 (80.4)
    Follicular (15-34 d before or on day of menses)9 (7.6)10 (8.9)
    Long cycle (35+ d before menses)3 (2.5)6 (5.4)
    Missing7 (5.9)6 (5.4)
Hormonal contraceptive use0.76
    Never7 (5.9)9 (8.0)
    Former46 (39.0)40 (35.7)
    Current65 (55.1)63 (56.3)
Smoking status0.55
    Never59 (50.0)64 (57.1)
    Former25 (21.2)21 (18.8)
    Current34 (28.8)27 (24.1)
Alcohol consumption status0.38
    Never3 (2.5)7 (6.2)
    Former6 (5.1)5 (4.5)
    Current109 (92.4)100 (89.3)
History of breast cancer in mother3 (2.7)5 (4.5)0.72
  • *P values from Student's t test.

  • P values from Fisher's exact test or χ2 test.