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Table 2 Positive predictive value estimates for weighted scoring applied to all respondents to 1995 postal survey (n = 6825)

From: Development of a questionnaire weighted scoring system to target diagnostic examinations for asthma in adults: a modelling study

Threshold Score Number of individuals above threshold Number eligible for review (no asthma diagnosis) Undiagnosed individuals expected to be diagnosed clinically asthmatic
    Number Percent (Positive predictive value)
11 76 13 12 90.5
10 178 33 31 94.2
9 335 80 75 93.5
8 577 195 161 82.5
7 891 394 310 78.8
6 1289 715 437 61.2
5 2098 1427 678 47.5
4 3332 2592 769 29.7
3 4667 3874 894 23.1
2 5769 4938 929 18.8
1 6524 5670 933 16.5
All respondents 6825 5964 934 15.7