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Melchart, Dieter; Weidenhammer, W.; Linde, K. (1998): Beobachtungsstudien im Rahmen eines naturheilkundlichen Klinikverbunds :Teil IV: Methodische Aspekte, Diskussion und Empfehlungen. In: Forschende Komplementärmedizin, Nr. 4: S. 184-189
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Abstract

Objective: Empirical investigation of the influence of patient self-selection during follow-up in a prospective observational study in 4 in-patient facilities for complementary medicine and discussion of further methodological problems. Methods: 2662 patients treated in the 4 hospitals and included in a prospective observational study had been sent follow-up questionnaires 2, 6, and 12 months after admission. Characteristics and therapeutic success at discharge were compared in patients responding and those not responding. Results: Patients not responding to the follow-up questionnaires tended to be older and to assess the benefit of the treatment less positive than patients who responded (hospital one: 56.2% of patients with a follow-up reported a good or very good response to therapy at discharge compared to 37.7% of the patients without a follow-up: hospital two: 63.7% vs. 54.6%; hospital three: 71.1% vs. 65.8%; hospital four: 78,3% vs. 70,9%). Interpretation: When interpreting the results of the observational study a certain degree of bias induced by selection during follow-up has to be taken into account. Discussion: Other methodological problems discussed narratively include spontaneous improvements, reliability of baseline measures, influence of effective cointerventions, side-effects, outcome measures, feasibility, and efficiency. Finally, recommendations for quality management programs in in-patient facilities for complementary medicine are provided.