Table 4 Incidence Rate Ratios (IRRs) for country of birth and invasive breast cancer by ER status
From: Incidence of breast cancer subtypes in immigrant and non-immigrant women in Norway
|  | Age 20–75 | Age 20–49 | ||||||
|---|---|---|---|---|---|---|---|---|
ER- | ER +  | ER- | ER +  | |||||
Cases | IRR (CI) | Cases | IRR (CI) | Cases | IRR (CI) | Cases | IRR (CI) | |
Non-immigrants | 3282 | 1.00 (ref) | 17,844 | 1.00 (ref) | 959 | 1.00 (ref) | 3645 | 1.00 (ref) |
High-income | 94 | 0.95 (0.78–1.17) | 561 | 1.09 (1.00–1.18) | 29 | 0.85 (0.59–1.23) | 120 | 0.97 (0.81–1.16) |
Eastern Europe | 66 | 0.76 (0.60–0.98) | 336 | 0.86 (0.77–0.95) | 35 | 0.73 (0.52–1.03) | 155 | 0.96 (0.82–1.12) |
Middle East | 23 | 0.89 (0.59–1.34) | 110 | 0.95 (0.78–1.14) | 13 | 0.85 (0.49–1.47) | 55 | 1.03 (0.79–1.34) |
Sub-Saharan Africa | 13 | 0.71 (0.41–1.22) | 43 | 0.57 (0.42–0.77) | 12 | 0.93 (0.53–1.65) | 28 | 0.66 (0.46–0.96) |
South Asia | 41 | 1.36 (1.00–1.85) | 96 | 0.67 (0.55–0.82) | 16 | 1.06 (0.65–1.75) | 45 | 0.85 (0.64–1.14) |
South-East Asia | 31 | 0.70 (0.49–1.00) | 142 | 0.71 (0.60–0.84) | 18 | 0.70 (0.44–1.11) | 79 | 0.89 (0.71–1.11) |