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Table 3 Incidence rate ratio (IRR) in Sweden by education, calendar year and area of diagnosis

From: Breast cancer incidence and case fatality among 4.7 million women in relation to social and ethnic background: a population-based cohort study

 

Immigrants

Immigrants' daughters

Native Swedes

 

Cases

PYRS$

IRR* (95% CI)

Cases

PYRS$

IRR* (95% CI)

Cases

PYRS$

IRR* (95% CI)

Years of education

         

   13+

2,142

2,661

1.28 (1.21 to 1.36)

1,029

3,010

1.18 (1.06 to 1.32)

17,963

3,0772

1.18 (1.16 to 1.21)

   10 to 12

3,365

4,572

1.14 (1.08 to 1.20)

1,292

4,521

1.07 (0.96 to 1.19)

26,595

4,6316

1.05 (1.03 to 1.07)

   0 to 9

2,866

3,529

Reference

478

1,641

Reference

19,644

2,3095

Reference

   Unknown

480

1,296

1.02 (0.93 to 1.13)

9

2,286

0.99 (0.50 to 1.89)

289

8,864

1.41 (1.26 to 1.58)

Calendar period of follow-up

         

   1961 to 1985

1,069

3,738

0.83 (0.75 to 0.91)

145

3,992

0.82 (0.66 to 1.01)

8,321

48,239

0.75 (0.73 to 0.78)

   1986 to 1995

2,123

2,991

0.87 (0.81 to 0.92)

565

2,826

0.92 (0.81 to 1.03)

16,687

25,836

0.87 (0.85 to 0.89)

   1996 to 2000

1,848

2,003

0.89 (0.84 to 0.95)

674

1,769

1.05 (0.96 to 1.16)

14,046

14,169

0.95 (0.93 to 0.97)

   2001 to 2007

3,813

3,328

Reference

1,424

2,871

Reference

25,437

20,803

Reference

Area of residence at diagnosis

         

   Gothenburg

1,641

2,391

0.93 (0.87 to 0.98)

543

2,313

0.89 (0.80 to 1.00)

11,548

21,632

0.83 (0.81 to 0.85)

   Linkoping

687

950

1.00 (0.92 to 1.09)

201

884

0.89 (0.76 to 1.04)

7,341

12,762

0.87 (0.84 to 0.89)

   Lund-Malmo

1,569

1,993

1.05 (0.98 to 1.11)

437

1,730

0.99 (0.88 to 1.11)

12,003

18,074

0.99 (0.97 to 1.02)

   Stockholm

2,906

3,898

Reference

839

3,497

Reference

12,992

20,870

Reference

   Umea

460

648

0.94 (0.85 to 1.03)

250

827

0.79 (0.69 to 0.91)

6,653

12,301

0.80 (0.77 to 0.82)

   Uppsala

1,590

2,131

0.97 (0.91 to 1.03)

538

2,123

0.90 (0.81 to 1.00)

13,954

23,171

0.89 (0.87 to 0.91)

  1. * All IRRs are adjusted for age at follow-up and calendar period of follow-up and the other two variables shown. $PYRS = person-years at risk divided by 1,000.
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Breast Cancer Research

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