Table 4 Prognostic indicators for breast cancers diagnosed in ever- vs never screeneda women, New Zealand women aged 45–69 years at year of diagnosis, 2000–2011
Ever screened | Never screened | ||||
|---|---|---|---|---|---|
Prognostic indicator | n | % | n | % | Significance of difference |
Grade of tumour | |||||
Well differentiated | 3725 | 29.6 | 1624 | 18 | χ2(1)=384, P<0.0001 |
Excluding not recorded or NA (n=1498) | 31.2 | 19.9 | χ2(1)=321, P<0.0001 | ||
Moderately differentiated | 5196 | 41.3 | 3679 | 40.3 | |
Poorly or undifferentiated or anaplastic | 3014 | 24 | 2877 | 31.8 | |
Not recorded/NA | 638 | 5.1 | 860 | 9.5 | |
Overall heterogeneity: χ2(3)=558, P<0.0001 | |||||
Extent of disease | |||||
Localised | 7928 | 63.1 | 4169 | 46.1 | χ2(1)=613, P<0.0001 |
Excluding unknown (n=1697) | 67.3 | 51.2 | χ2(1)=521, P<0.0001 | ||
Adjacent organ or regional lymph node | 3662 | 29.1 | 3521 | 38.9 | |
Distant | 190 | 1.5 | 447 | 4.9 | |
Distant÷(distant+regional) | 4.9 | 11.3 | RR=0.44 (0.37–0.52) | ||
Unknown | 793 | 6.3 | 904 | 10 | χ2(1)=105, P<0.0001 |
Overall heterogeneity: χ2(3)=724, P<0.0001 | |||||
Multiple tumours | |||||
No | 12 344 | 98.2 | 8697 | 96.2 | RR=0.48 (0.41–0.56) |
Yes | 229 | 1.8 | 344 | 3.8 | χ2(1)=80.2, P<0.0001 |
Maximum tumour size | mm | mm | |||
Mean | 18.1 | 24.4 | t=−25.8, P<0.0001 | ||
Median | 15 | 20 | z=−27.8, P<0.0001b | ||
