Table 7 Comparison of key results with previous studies

Average annual research investment

(for years of data used in IRR calculation as reported in source publications, using different time period for calculating constant prices and therefore not suitable for comparisons)

£70 m

(1978–1997, in constant 2013–2014 prices)

£266 m

(1976–1995, in constant 2011–2012 prices)

£111 m

(1975–1998, in constant 2005–2006 prices)

Average annual research investment

(rebased in same constant prices for comparative purposes)

£70 m

(1978–1997, in constant 2013–2014 prices)

£290 m

(1976–1995, in constant 2013–2014 prices)

£133 m

(1975–1998, in constant 2013–2014 prices)

Elapsed time

(between spending on research and health gain)

16 years

15 years

17 years

Attribution

(proportion of papers that include a United Kingdom address from the papers cited on guidelines)

30%

17%

17%

Average NMB

(for years of data used in IRR calculation as reported in source publications, but using different time period for calculating constant prices therefore not suitable for comparisons)

£801 m

(1994–2013, in constant 2013–2014 prices)

£6223 m

(1991–2010, in constant 2011–2012 prices)

£2949 m

(1992–2005, in constant 2005–2006 prices)

Average NMB

(rebased in same constant prices for comparative purposes)

£801 m

(1994–2013, in constant 2013–2014 prices)

£6458 m

(1991–2010, in constant 2013–2014 prices)

£3559 m

(1992–2005, in constant 2013–2014 prices)

IRR (health gain)

7%

10%

9%