Univariate analysis of prognostic factors comparing women with stage I breast cancer who do (cases) or do not (controls) have distant metastases
| Variable | Controls (n) | Cases (n) | p Value |
|---|---|---|---|
| Age | |||
| <50 | 13 | 16 | |
| 50–69 | 30 | 24 | |
| 70+ | 7 | 10 | 1.000 |
| Side | |||
| Left | 26 | 23 | |
| Right | 24 | 27 | 0.689 |
| Tumour grade | |||
| Well/moderate | 13 | 9 | |
| Poor/undifferentiated | 22 | 28 | |
| Unknown | 15 | 13 | 0.452 |
| Tumour size | |||
| 1: 2 cm | 1 | 2 | |
| 1A: ⩽0.5 cm | 1 | 2 | |
| 1B: >0.5 to ⩽1 cm | 17 | 11 | |
| 1C: >1 to <2 cm | 31 | 35 | 0.576 |
| Type of surgery | |||
| Mastectomy | 19 | 25 | |
| Lumpectomy | 31 | 25 | 0.314 |
| Radiotherapy | |||
| Yes | 33 | 26 | |
| No | 17 | 24 | 0.222 |
| Screen detected | |||
| No | 33 | 39 | |
| Yes | 17 | 11 | 0.265 |
| Incidence period | |||
| 1988–1991 | 14 | 12 | |
| 1992–1997 | 36 | 38 | 0.820 |