Table 2 Participant characteristics, demographics and fluid production status
| Â | Overall, No. (%) | NAF Producers, No. (% of subgroup) | p-value |
|---|---|---|---|
Total No. of Women Enrolled | 500 | 190 (38.0) | Â |
Age groups, y, No. (%) | Â | Â | p <= 1.0 |
   18–24 | 63 (12.6) | 16 (25.4) |  |
   25–34 | 93 (18.6) | 36 (38.7) |  |
   35–44 | 115 (23.0) | 45 (39.1) |  |
   45–54 | 155 (31.0) | 65 (41.9) |  |
   55–64 | 71 (14.2) | 26 (36.6) |  |
   65+ | 3 (0.6) | 2 (66.7) |  |
Parity, No. (%) | Â | Â | p <= 0.05 *** |
   Nulliparous | 83 (16.6) | 40 (48.2) |  |
   Parous | 417 (83.4) | 150 (36.0) |  |
Age at Menarche, years, No. (%) | Â | Â | p <= 1.0 |
   <=12 | 241 (48.2) | 90 (37.3) |  |
   13–14 | 193 (38.6) | 77 (39.9) |  |
   >=15 | 61 (12.2) | 21 (34.4) |  |
   Missing | 5 (1.0) | 2 (40) |  |
Ethnicity, No. (%) | Â | Â | p <= 1.0 |
   Caucasian | 445 (89.0) | 173 (38.9) |  |
   Non-Caucasian* | 55 (11.0) | 17 (30.9) |  |
1st Degree Relatives with breast cancer, No. (%) | Â | Â | p <= 0.1 |
   No | 429 (85.8) | 156 (36.4) |  |
   Yes, 1 | 67 (13.4) | 31 (46.3) |  |
   Yes, >=2 | 4 (0.8) | 3 (75.0) |  |
History of breast biopsy, No. (%) | Â | Â | p <= 1.0 |
   Yes** | 56 (11.2) | 22 (39.3) |  |
Menstrual status, No. (%) | Â | Â | p <= 1.0 |
   Pre-Menopausal | 358 (71.6) | 137 (38.3) |  |
   Menopausal | 142 (28.4) | 53 (37.3) |  |
Lactation history, No. (%) | Â | Â | p <= 0.1 |
   Never lactated | 268 (53.6) | 92 (48.4) |  |
   History of lactation | 232 (46.4) | 98 (51.6) |  |