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. Author manuscript; available in PMC: 2010 Jun 28.
Published in final edited form as: Thorax. 2010 Jun;65(6):492–498. doi: 10.1136/thx.2009.129395

Figure 3.

Figure 3

Effect of varying key parameters on rate difference of active versus opportunistic case finding for chronic obstructive pulmonary disease (COPD). For each of the following eight parameters, the graphs indicate how changes in the estimates of the parameter (proportions from 0 to 1) affect the estimates of relative effectiveness of the active approach. Bold portions of the line indicate the most plausible range of interest. (a) Proportion of target population with specified respiratory symptoms. (b) Proportion of those with respiratory symptoms having clinically significant COPD. (c) Probability that patients with COPD visit their GP (general practitioner) at least once per year. (d) Probability that patients without COPD visit their GP at least once per year. (e) Uptake in response to postal questionnaire. (f) Probability GP/nurse will ask respiratory questions opportunistically. (g) Proportion of patients responding to questions administered at the surgery. (h) Uptake of spirometry.