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Table 1 Calculations of absolute difference, relative difference, crude and age-standardised incidence rates of HF in 2018 using 1–10 years of lookback

From: A nationwide registry study on heart failure in Norway from 2008 to 2018: variations in lookback period affect incidence estimates

LP (years)

No. of incident cases in 2018

AD, n

RD, %

Crude IR

ASR

Women

10

6842

  

3.36

3.78

9

6900

58

0.8

3.39

3.81

8

6979

137

2.0

3.43

3.86

7

7076

234

3.4

3.48

3.91

6

7202

360

5.3

3.54

3.98

5

7379

537

7.8

3.63

4.08

4

7642

800

11.7

3.76

4.23

3

8033

1191

17.4

3.95

4.44

2

8751

1909

27.9

4.30

4.84

1

10,548

3706

54.2

5.18

5.82

Men

10

8020

  

3.95

6.06

9

8116

96

1.2

3.99

6.14

8

8226

206

2.6

4.05

6.23

7

8378

358

4.5

4.12

6.35

6

8578

558

7.0

4.22

6.50

5

8833

813

10.1

4.35

6.71

4

9226

1206

15.0

4.54

7.03

3

9776

1756

21.9

4.81

7.46

2

10,817

2797

34.9

5.32

8.25

1

13,816

5796

72.3

6.80

10.35

Total

10

14,862

  

3.65

4.74

9

15,016

154

1.0

3.69

4.79

8

15,205

343

2.3

3.74

4.85

7

15,454

592

4.0

3.80

4.94

6

15,780

918

6.2

3.88

5.04

5

16,212

1350

9.1

3.99

5.18

4

16,868

2006

13.5

4.15

5.40

3

17,809

2947

19.8

4.38

5.70

2

19,568

4706

31.7

4.81

6.27

1

24,364

9502

63.9

5.99

7.74

  1. LP lookback period, AD absolute difference, RD relative difference, calculated as the AD divided by the number of incident HF cases for the lookback period of 10 years, expressed as percentage. IR incidence rate per 1000 person years, ASR age-standardized incidence rate per 1000 person years