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Table 1 Results of pairs of studies using the IMPACT model: for each of 4 countries one study was performed using Deaths Prevented or Postponed (DPPs) and one using Life Years Gained (LYG).

From: Why choice of metric matters in public health analyses: a case study of the attribution of credit for the decline in coronary heart disease mortality in the US and other populations

 

DPPs (% share)

LYG (% share)

LYG per DPP

USA 1980-2000 [4, 11]

   

Better treatment

159,300 (52%)

1,092,300 (35%)

6.9

Favourable risk factor changes

149,600 (48%)

2,055,600 (65%)

13.7

Ireland 1985-2000 [3, 10]

   

Better treatment

1640 (47.5%)

14,505 (31%)

8.8

Favourable risk factor changes

1810 (52.5%)

32,705 (69%)

18

England and Wales 1981-2000 [2, 8]

   

Better treatment

25,765 (42%)

194,145 (21%)

7.5

Favourable risk factor changes

35,830 (58%)

731,270 (79%)

20.4

Scotland 1975-1994 [1, 9]

   

Better treatment

1862 (41%)

12025 (25%)

6.5

Favourable risk factor changes

2674 (59%)

35991 (75%)

13.5

  1. Data are the population totals for DPP and LYG (% share) and the ratios of LYG to DPP
  2. DPP = Deaths Prevented or Postponed LYG = Life Years Gained