Table 1.
Breast Cancer Reproductive and Hormonal Risk Factors by Level of Acculturation in Ella Participants with Known Age at Diagnosis and Level of Education (n=1201)
| Mexican American | ||||
|---|---|---|---|---|
| Participant characteristics | Mexican (n=581) | Spanish dominant (n=202) | Bilingual (n=295) | English dominant (n=123) |
| Age at diagnosis (years), mean±standard deviation (SD) | 54.5±12.5 | 51.2±12.0 | 49.5±11.7 | 49.2±12.2 |
| Highest level of education, n (%) | ||||
| Less than high school | 389 (67.0) | 139 (68.8) | 57 (19.3) | 17 (13.8) |
| High school or equivalent | 130 (22.4) | 51 (25.3) | 90 (30.5) | 42 (34.2) |
| Post high school | 62 (10.7) | 12 (5.94) | 148 (50.2) | 64 (52.0) |
| Age at menarche (years), mean±SDa | 13.0±1.5 | 12.9±1.5 | 12.4±1.7 | 12.2±1.6 |
| Age at menarche <12 years, n (%)a | 93 (16.0) | 32 (15.9) | 84 (28.5) | 42 (34.2) |
| Hormone contraceptive use (ever), n (%)b | 304 (52.3) | 99 (49.0) | 203 (68.8) | 75 (62.0) |
| Nulliparity, n (%) | 55 (9.5) | 12 (5.9) | 32 (10.8) | 20 (16.3) |
| Age at first full-term pregnancy, mean±SDc | 22.9±5.5 | 21.9±5.0 | 22.9±5.5 | 23.0±5.8 |
| Age at first full-term pregnancy ≥30 years, n (%)c | 73 (13.9) | 15 (7.89) | 34 (12.9) | 13 (12.6) |
| Number of full-term pregnancies, mean±SD | 3.6±2.6 | 3.4±2.0 | 2.7±1.8 | 2.1±1.5 |
| Number of full-term pregnancies ≥3, n (%) | 302 (72.6) | 131 (69.0) | 160 (60.8) | 51 (49.5) |
| Ever breastfed (if parous), n (%)d | 466 (89.1) | 144 (76.2) | 165 (63.2) | 53 (51.5) |
| Lifetime breastfeeding (if parous, months), mean±SDd | 30.5±39.9 | 18.9±23.5 | 8.4±12.7 | 4.7±10.7 |
| Lifetime breastfeeding ≥6 months (if parous), n (%)d | 391 (74.8) | 117 (61.9) | 102 (39.1) | 23 (22.3) |
| Time since last pregnancy (if premenopausal, years), mean±SDe | 13.5±7.3 | 12.5±7.7 | 12.9±8.3 | 13.2±7.9 |
| Time since last pregnancy ≤10 years (if premenopausal), n (%)e | 77 (35.3) | 46 (44.2) | 60 (40.3) | 22 (34.9) |
| Postmenopausal, n (%)f | 329 (57.3) | 88 (44.9) | 123 (41.8) | 44 (36.4) |
| Age at natural menopause (years), mean±SDg | 49.0±5.2 | 48.8±5.1 | 50.1±4.8 | 50.4±3.4 |
| Age at natural menopause ≥50 years, n (%)g | 136 (51.1) | 31 (46.3) | 39 (55.7) | 13 (68.4) |
| Menopausal hormone therapy use, n (%)h | 63 (11.0) | 19 (9.45) | 57 (19.4) | 20 (16.5) |
Missing data for age at menarche for 1 participant.
Missing data for hormone contraceptive use for 2 participants.
Missing data for age at first full-term pregnancy for 1 participant, plus 119 women were nulliparous.
Missing data for breastfeeding for 6 participants, plus 119 women were nulliparous.
Missing data for time since last pregnancy for 67 participants, plus 584 women were postmenopausal, and 16 women had unknown menopausal status.
Missing data for menopausal status for 16 participants.
Missing data for age at menopause for 162 participants who had nonnatural (or unknown cause of) menopause, plus 601 women were premenopausal, and 16 women had unknown menopausal status.
Missing data for menopausal hormone therapy use for 12 participants.