Characteristics | Age group 22 - 34 years |
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| Age group 35 - 44 years |
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| Age group 45 years and over |
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| Overall series |
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| Control patients
n = 64 (%) | Breast cancer patients n = 60 (%) | p | Control patients
n = 112 (%) | Breast cancer patients n = 108 (%) | p | Control patients n = 224 (%) | Breast cancer patients n = 232 (%) | p | Control patients n = 400 (%) | Breast cancer patients n = 400 (%) | p |
Age at first full term pregnancy |
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No | 28 (43.8) | 45 (75) | 0.001 | 13 (11.6) | 30 (27.8) | <0.001 | 14 (6.3) | 28 (12.1) | <0.001 | 55 (13.8) | 103 (25.8) | <0.001 |
<30 years | 35 (54.7) | 13 (21.7) |
| 88 (78.6) | 44 (40.7) |
| 146 (65.2) | 76 (32.8) |
| 269 (67.3) | 133 (33.3) |
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≥30 years | 1 (1.6) | 2 (3.3) |
| 11 (9.8) | 34 (31.5) |
| 64 (28.6) | 128 (55.2) |
| 76 (19) | 164 (41) |
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Number of birth |
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Nulliparous | 28 (43.8) | 45 (75) | <0.001 | 12 (10.7) | 29 (26.9) | 0.002 | 13 (5.8) | 28 (12.1) | <0.001 | 53 (13.3) | 102 (25.5) | <0.001 |
1 to 2 | 23 (35.9) | 3 (5) |
| 10 (8.9) | 15 (13.9) |
| 0 (0) | 28 (12.1) |
| 33 (8.3) | 46 (11.5) |
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≥3 | 13 (20.3) | 12 (20) |
| 90 (80.4) | 64 (59.3) |
| 211 (94.2) | 176 (75.9) |
| 314 (78.5) | 252 (63) |
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Duration of breastfeeding |
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Never | 27 (42.2) | 46 (75) | 0.001 | 12 (10.7) | 32 (29.6) | 0.002 | 13 (5.8) | 30 (12.9) | 0.001 | 52 (13) | 107 (26.8) | <0.001 |
<6 month | 20 (31.3) | 3 (5) |
| 15 (13.4) | 14 (13) |
| 11 (4.9) | 27 (11.6) |
| 46 (11.5) | 44 (11) |
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≥6 month | 17 (26.6) | 12 (20) |
| 85 (75.9) | 62 (57.4) |
| 200 (89.3) | 175 (76.4) |
| 302 (75.5) | 249 (62.3) |
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