Table 1.
Women included in the study, descriptive statistics
| all non-cancer (%) | cluster 1 (%) | cluster 2 (%) | p-value (cluster 1 vs 2) | ||
|---|---|---|---|---|---|
| Age | mean | 50.2 | 49.3 | 49.8.4 | 0.87 1) |
| <40 | 14 (18) | 3 (25) | 11 (16) | ||
| 40-49 | 17 (22) | 2 (17) | 15 (22) | ||
| 50-69 | 43 (54) | 6 (50) | 37 (55) | ||
| 70+ | 2 (3) | 1 (8) | 1 (1) | ||
| missing | 3 (4) | 0 (0) | 3 (4) | ||
| Parity | 0 | 10 (13) | 4 (33) | 6 (9) | 0.052) |
| 1+ | 65 (82) | 8 (67) | 57 (85) | ||
| missing | 4 (5) | 0 (0) | 4 (6) | ||
| Age at first birth | mean | 24.4 | 24 | 24.6 | 0.75 1) |
| no children | 10 (13) | 4 (33) | 6 (9) | ||
| <25 | 30 (38) | 4 (33) | 26 (39) | ||
| 25-34 | 24 (30) | 3 (25) | 21 (31) | ||
| 35+ | 2 (3) | 0 (0) | 2 (3) | ||
| missing | 13 (16) | 1 (8) | 12 (18) | ||
| Hormone therapy use | never | 55 (70) | 8 (67) | 47 (70) | 0.72 2) |
| current | 11 (14) | 2 (17) | 9 (13) | ||
| past | 6 (8) | 0 (0) | 6 (9) | ||
| missing | 7 (9) | 2 (17) | 5 (7) | ||
| Body mass index | mean | 24 | 23 | 24.5 | 0.24 1) |
| <20 | 5 (6) | 2 (17) | 3 (4) | ||
| 20-<25 | 44 (56) | 6 (50) | 38 (57) | ||
| 25-<30 | 21 (27) | 4 (33) | 17 (25) | ||
| 30+ | 6 (8) | 0 (0) | 6 (9) | ||
| missing | 3 (4) | 0 (0) | 3 (4) | ||
| Mammographic density | mean | 39.6 | 36.7 | 37 | 0.62 1) |
| 0-<23 | 19 (24) | 2 (17) | 17 (25) | ||
| 23-<37 | 21 (27) | 4 (33) | 17 (25) | ||
| 37-<52 | 19 ((24) | 3 (25) | 16 (24) | ||
| 52+ | 17 (22) | 3 (25) | 14 (21) | ||
| missing | 3 (4) | 0 (0) | 3 (4) | ||
| Referral source | risk/lump | 32 (41) | 9(75) | 23 (33) | 0.0072) |
| screening | 28 (36) | 0 (0) | 28 (42) | ||
| unknown | 19 (24) | 3 (25) | 16 (24) | ||
1) Two-sided t-test for continuous variables
2) Fisher exact test for categorical variables with <5 observations in certain cells