Table 5.
The proportions of breast cancer risk factors among 924 patients with detected breast cancer who participated in the first round of the “Mamma” program
| No. (%) of breast cancer patients |
|||||
|---|---|---|---|---|---|
| Characteristics | rural (n = 654) | urban (n = 270) | Difference (95%confidence interval) | χ2 | P |
| Body mass index >30 (kg/m2) |
271 (41.4) |
76 (28.1) |
13.31 (6.52 to 19.66) |
13.403 |
<0.001 |
| Menarche: |
|||||
| <12 |
38 (5.9) |
26 (9.7) |
3.45 (0.45 to 7.34) |
3.058 |
0.080 |
| ≥14 |
346 (52.9) |
126 (46.5) |
6.30 (-0.77 to 13.37) |
2.778 |
0.095 |
| Parity |
590 (90.3) |
231 (85.6) |
4.76 (-0.01 to 9.53) |
3.928 |
0.047 |
| First live birth <20 y |
132 (20.2) |
20 (7.4) |
12.78 (8.4 to 17.16) |
21.794 |
<0.001 |
| Breast-feeding |
524 (80.1) |
199 (73.7) |
6.42 (0.34 to 12.5) |
4.258 |
0.039 |
| Exogenous hormones: |
|||||
| oral contraceptive use (% ever) |
114 (17.4) |
55 (20.4) |
2.94 (-2.67 to 8.5) |
0.917 |
0.338 |
| hormonal replacement therapy use (% ever) |
59 (9.0) |
43 (15.9) |
6.90 (-2.01 to 11.78) |
8.577 |
0.003 |
| Breast cancer history: |
|||||
| in first-degree relative |
43 (6.5) |
32 (11.8) |
5.28 (0.98 to 9.58) |
6.456 |
0.011 |
| in second-degree relative |
30 (4.6) |
15 (5.9) |
1.34 (-1.9 to 4.58) |
0.470 |
0.493 |
| Prior screening before 2-3 y |
94 (14.4) |
85 (31.5) |
17.11 (10.95 to 23.27) |
34.735 |
<0.001 |
| Breast symptoms | 126 (19.2) | 50 (18.6) | 0.62 (4.92 to 6.16) | 0.016 | 0.899 |