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 |