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Innovation in clinical specialities: cardiovascular disease<br />

(1988–2002), 3,4 linear projections were made from 1988–1994<br />

through 1999–2002 to the country’s population in 2010 of recent<br />

trends in total cholesterol (mg/dl), smoking (%), systolic blood<br />

pressure (mmHg), body mass index (BMI) (kg/m 2 ), all diabetes (%)<br />

and any leisure-time physical activity (%), all stratified by age and<br />

sex 10,22,23 (Table 3).<br />

The second scenario assumed risk factor levels equal to the<br />

substantial but feasible reductions defined in the HP2010<br />

objectives. 3 In the absence of specific HP2010 targets for BMI,<br />

total diabetes and systolic blood pressure, we assumed that: (i)<br />

the 15% obesity target would equate to a population mean BMI of<br />

25 kg/m 2 for men and 26 kg/m 2 for women; (ii) the 25 per 1000<br />

population clinically diagnosed diabetes prevalence target would<br />

equate to a total (diagnosed and undiagnosed) type 1 and type 2<br />

diabetes prevalence of 6%; and (iii) the 16% hypertension<br />

prevalence target would equate to a population mean systolic<br />

blood pressure of 119 mmHg, representing a 5 mmHg reduction<br />

from 2000 levels (Table 3).<br />

In the third scenario, mean population risk factors were<br />

assumed to reach levels already observed in the “healthiest”<br />

stratum of cohorts in the USA, as defined by Stamler et al. 24 and<br />

Daviglus et al. 25 Levels for specific risk factors were as follows: (i)<br />

no smoking among men or women; (ii) 175.6 mg/dl (4.54 mmol/l)<br />

total cholesterol for men and 179.6 mg/dl (4.64 mmol/l) for<br />

women; (iii) a mean systolic blood pressure of 115.7 mmHg for<br />

men and 114.7 mmHg for women, representing a 10mmHg<br />

reduction from 2000 levels; (iv) a BMI of 25.5 kg/m 2 for men and<br />

23.6 kg/m 2 for women; (v) zero prevalence of diabetes among<br />

both men and women. 24,25 Physical activity was not specifically<br />

considered by in these studies, 24,25 so we defined the level in the<br />

lowest risk stratum as 100%, with everyone undertaking some<br />

leisure-time physical activity. (Table 3). To preserve the focus on<br />

risk factor changes, we assumed that the proportion of the<br />

population receiving medical and surgical treatments for CHD<br />

would remain constant.<br />

Sensitivity analysis<br />

Because of the uncertainties surrounding some of the estimates,<br />

a multi-way sensitivity analysis was performed using the analysis<br />

of extremes method. 28 Minimum and maximum estimates of<br />

deaths prevented or postponed were generated using minimum<br />

and maximum plausible values for the main parameters: 95%<br />

confidence intervals when available; otherwise, the best value<br />

±20%. 10,22,23,28 The Supplementary Appendix (available at:<br />

http://content.nejm.org/cgi/data/356/23/2388/DC1/1) provides<br />

worked examples of the calculations used in the model plus<br />

further details on the methods and data sources used. 10<br />

Results<br />

Trends and estimates<br />

Approximately 388 000 CHD deaths among people aged 25–84<br />

years would be expected in 2010 if the same age-specific death<br />

rates recorded in 2000 (the base year) were also observed in<br />

2010. This number would represent 15% more than the 338 000<br />

deaths observed in 2000, reflecting population aging<br />

compounded by an increase in population size (Table 4).<br />

Between 1997 and 2002, the overall annual declines observed<br />

in CHD mortality rates were 2% for men and 1% for women.<br />

Table base-year 5: Estimated following reduction changes in coronary in specific heart risk factors disease mortality in the United States of America in 2010 compared with the 2000<br />

base-year following changes in specific risk factors<br />

Risk factor changes<br />

Absolute values<br />

Fewer (additional) CHD deaths in 2010 with<br />

risk factor changes a<br />

MenBest<br />

estimate<br />

WomenBest<br />

estimate<br />

Men Women Best estimate Minimum Maximum<br />

Smoking prevalence in 2000 27.3% 21.9%<br />

If<br />

recent trends continue to 2010<br />

22.6% 18.7% -10 000 -8 000 -12 000 - 7 000 -3 000<br />

If<br />

HP2010 targets are achieved<br />

12.0% 12.0% -26 000 -21 000 -32 000 - 18 000 -8 000<br />

If<br />

all in low-risk stratum<br />

0% 0%<br />

-60 000 -48 000 -72 000 - 42 000 -18000<br />

Total cholesterol in 2000 205.0 206.9<br />

If<br />

recent trends continue to 2010<br />

204.2 204.3 -28 000 -17 000 -41 000 - 15 000 -14 000<br />

If<br />

HP 2010 targets are achieved<br />

199.0 199.0 -40 000 -24 000 -59 000 - 17 000 -24 000<br />

If<br />

all in low-risk stratum<br />

175.6 179.6 -103 000 -70 000 -160 000 - 68 000 -35 000<br />

Population systolic blood pressure in 2000 124.4 123.9<br />

I f recent trends continue to 2010<br />

125.3 128.5 (+2 000) (+1 000) (+4 000) - 6 000 (+8 000)<br />

If<br />

HP2010 targets are achieved<br />

119.4 118.9 -48 000 -39 000 -58 000 - 28 000 -20 000<br />

If<br />

all in low-risk stratum<br />

115.7 114.7 -83 000 -75 000 -108 000 - 54 000 -29 000<br />

Body mass index (BMI) in 2000 27.86 28.51<br />

If recent upward trends continue to 2010 29.18 30.16 (+8 000) (+5 000) (+11 000) (+5 000) (+3 000)<br />

If<br />

HP2010 targets are achieved<br />

25.00 26.00 -17 000 -10 000 -24 000 - 12 000 -5 000<br />

If<br />

all in low-risk stratum<br />

25.50 23.60 -21 000 -12 000 -27 000 - 10 000 -10 000<br />

Diabetes in 2000 11.7% 9.5%<br />

If recent upward trends continue to 2010 15.2% 10.1% (+16 000) (+5 000) (+22 000) (+11 000) (+5 000)<br />

If<br />

HP2010 targets are achieved<br />

6.0% 6.0% -44 000 -26 000 -66 000 - 24 000 -20 000<br />

If<br />

all in low-risk stratum<br />

0% 0%<br />

-72 000 -49 000 -100 000 - 38 000 -34 000<br />

Physical activity in 2000 75.1% 70.5%<br />

If<br />

recent trends continue to 2010<br />

80.8% 74.1% -7 000 -6 000 -9 000 - 4 000 -2 000<br />

If<br />

HP2010 targets are achieved<br />

80% 80%<br />

-12 000 -10 000 -14 000 - 6 000 -6 000<br />

If<br />

all in low-risk stratum<br />

100% 100% -34 000 -27 000 -40 000 - 18 000 -16 000<br />

If recent downward trends continue (smoking,<br />

n/a n/a -51 000 -29 000 -57 000 - 32 000 19 000<br />

cholesterol, physical inactivity male BP)<br />

If recent upward trends continue (female BP, obesity, n/a n/a (+32 000) (+10 000) (+32 000) (+16 000) (+16 000)<br />

diabetes)<br />

Net<br />

effect if recent trends continue<br />

n/a n/a<br />

-19 000 -10 000 -25 000 - 16 000 -3 000<br />

If<br />

HP2010 targets are achieved<br />

n/a n/a<br />

-188 000 -129 000 -252 000 -105 000 -83 000<br />

If<br />

all in low-risk stratum<br />

n/a n/a<br />

-372 000 -281 000 -507 000 - 230 000 -142 000<br />

If only smoking, cholesterol and BP match low-risk<br />

n/a n/a -246 000 -194 000 -339 000 - 164 000 -82 000<br />

stratum<br />

If only BMI, diabetes and physical activity match low-risk n/a n/a -126 000 -87 000 -167 000 - 66 000 -60 000<br />

stratum<br />

HP2010, Health People 2010; BP, systolic blood pressure<br />

<strong>Hospital</strong> and Healthcare Innovation Book 2009/2010 71

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