Table 1:
Distribution of select characteristics by time since last childbirth among premenopausal women <50 years of age in Carolina Breast Cancer Study - Phase III, 2008–2013 (N=1179)
| Nulliparous (N=210) | 0–5 postpartum (N=160) | 5.1–10 postpartum (N=207) | 10.1–20 postpartum (N=438) | 20.1–30 postpartum (N=164) | |
|---|---|---|---|---|---|
| Age at diagnosis (years) | |||||
| Median (Range) | 42 (23, 49) | 37 (24, 49) | 41 (26, 49) | 44 (30, 49) | 47 (38, 49) |
| <30 | 14 (6.7) | 17 (10.6) | 4 (1.9) | 0 (0.0) | 0 (0.0) |
| 30–39 | 52 (24.8) | 96 (60.0) | 78 (37.7) | 60 (13.7) | 1 (0.61) |
| 40–49 | 144 (68.6) | 47 (29.4) | 125 (60.4) | 378 (86.3) | 163 (99.4) |
| p-valuea | <0.0001 | ||||
| Race | |||||
| Black | 97 (46.2) | 77 (48.1) | 92 (44.4) | 209 (47.7) | 108 (65.9) |
| Non-Black | 113 (53.8) | 83 (51.9) | 115 (55.6) | 229 (52.3) | 56 (34.2) |
| p-valuea | 0.7 | ||||
| Parity | |||||
| 1 | - | 47 (29.4) | 47 (22.7) | 94 (21.5) | 64 (39.0) |
| 2 | - | 57 (35.6) | 86 (41.6) | 199 (45.4) | 61 (37.2) |
| ≥3 | - | 56 (35.0) | 74 (35.8) | 145 (33.1) | 39 (23.8) |
| p-valueb | 0.05 | ||||
| Income | |||||
| <$20,000 | 34 (16.8) | 19 (12.0) | 24 (11.9) | 80 (19.1) | 46 (29.3) |
| $20,000–50,000 | 64 (31.5) | 44 (27.9) | 52 (25.7) | 134 (32.0) | 47 (29.9) |
| >$50,000 | 105 (51.7) | 95 (60.1) | 126 (62.4) | 205 (48.9) | 64 (40.8) |
| Missing | 7 | 2 | 5 | 19 | 7 |
| p-valuea | 0.2 | ||||
| Education | |||||
| ≤High school graduate/GED | 45 (21.4) | 26 (16.2) | 50 (24.1) | 140 (32.0) | 81 (49.4) |
| Some college/College graduate | 121 (57.6) | 99 (61.9) | 119 (57.5) | 249 (57.0) | 80 (48.8) |
| Post-graduate/Professional degree | 44 (21.0) | 35 (21.9) | 38 (18.4) | 48 (11.0) | 3 (1.8) |
| Missing | 0 | 0 | 0 | 1 | 0 |
| p-valuea | 0.5 | ||||
| Married | |||||
| No | 126 (60.0) | 43 (26.9) | 63 (30.4) | 164 (37.5) | 72 (43.9) |
| Yes | 84 (40.0) | 117 (73.1) | 144 (69.6) | 273 (62.5) | 92 (56.1) |
| Missing | 0 | 0 | 0 | 1 | 0 |
| p-valuea | <0.0001 | ||||
| Health Insurance at Baseline | |||||
| Yes | 186 (88.6) | 151 (94.4) | 198 (96.1) | 412 (94.3) | 150 (91.5) |
| No | 24 (11.4) | 9 (5.6) | 8 (3.9) | 25 (5.7) | 14 (8.5) |
| Missing | 0 | 0 | 1 | 1 | 0 |
| p-valuea | 0.05 |
a
P-values generated by chi-square test between nulliparous and >0–5 years postpartum women, except when expected cell count <5, they were calculated by Fisher’s exact test.
b
P-value for chi-square test between women >0–5 years vs. >10–20 years postpartum. Missing values were excluded from percentage calculations. Percentages may not add up to 100 due to rounding.