Table 5 |
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|
Information for estimating PPV for those scoring 9 or more in the 2001 population survey |
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|
Stratum (i) (number of 'yes' answers to key questions) |
Score (j) |
Number of respondents |
ωij proportion of population postal questionnaires in stratum i, |
∏'ij prevalence of asthma for score j in stratum i |
ωij × ∏'ij |
|
|
|||||
|
6 |
12 |
2 |
0.0250 |
0.9914 |
0.0248 |
|
6 |
11 |
6 |
0.0750 |
0.9914 |
0.0744 |
|
6 |
10 |
5 |
0.0625 |
0.9867 |
0.0616 |
|
6 |
9 |
7 |
0.0875 |
0.7996 |
0.0700 |
|
5 |
12 |
1 |
0.0125 |
0.7181 |
0.0090 |
|
5 |
11 |
3 |
0.0375 |
0.7181 |
0.0269 |
|
5 |
10 |
9 |
0.1125 |
0.9777 |
0.1100 |
|
5 |
9 |
16 |
0.2000 |
0.8938 |
0.1788 |
|
4 |
10 |
3 |
0.0375 |
0.8908 |
0.0334 |
|
4 |
9 |
11 |
0.1375 |
0.9975 |
0.1371 |
|
1 – 3 |
11 |
1 |
0.0125 |
0.9633 |
0.0120 |
|
1 – 3 |
10 |
3 |
0.0375 |
0.9757 |
0.0366 |
|
1 – 3 |
9 |
13 |
0.1625 |
0.9880 |
0.1606 |
|
Total |
80 |
1 |
|||
|
|
|||||
|
Estimated PPV for those scoring 9 or more:
|
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|
Hirsch et al. BMC Family Practice 2004 5:30 doi:10.1186/1471-2296-5-30 |
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