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  • Title: Validity of performance indicators for assessing prescribing quality: the case of asthma.
    Author: Pont LG, Denig P, van der Molen T, van der Veen WJ, Haaijer-Ruskamp FM.
    Journal: Eur J Clin Pharmacol; 2004 Jan; 59(11):833-40. PubMed ID: 14624323.
    Abstract:
    OBJECTIVES: The aim of this study was to assess the concurrent validity between the identification of sub-optimal treatment based on clinical information and computer generated indicators. Indicators that are associated with sub-optimal treatment in one of the four steps of asthma management were assessed. DESIGN: The ability of each indicator to identify patients with sub-optimal asthma treatment from computerised general practitioner (GP) prescription records was assessed by comparing them with the results of an individual patient assessment using clinical data. SETTING: Chronic asthma patients ( n=146) registered with 16 Dutch GPs. MAIN MEASURES: The sensitivity and positive predictive value (PPV) of each performance indicator was determined. RESULTS: The step-1 indicator, focusing on patients not prescribed a short-acting beta-agonist, had an acceptable sensitivity (0.86), but a low PPV (0.52). The two step-2 indicators, targeting under-prescription of inhaled corticosteroids, had sensitivities of 0.74 and 0.37 and PPVs of 0.46 and 0.71, respectively. The step-3 indicator, which targeted under-dosing of inhaled corticosteroids, had a sensitivity of 0.07 and a PPV of 0.2. The fourth indicator, focusing on under-prescription of long-acting beta-agonists, could not be validated due to inadequate numbers of patients with severe asthma in our study sample. DISCUSSION: None of the indicators investigated was considered valid for assessing prescriber performance, despite having good face and content validity. Performance indicators that have not been validated can only provide a broad-brush approach for assessing prescribing quality and should be used with extreme caution.
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