Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: A comparison of conventional and retrospective measures of change in symptoms after elective surgery | Bitzer et al. Health and Quality of Life Outcomes 2011 9 23 http content 9 1 23 HEALTH AND QUALITY OF LIFE OUTCOMES RESEARCH Open Access A comparison of conventional and retrospective measures of change in symptoms after elective surgery 2 1 1 13 Eva M Bitzer Marco Petrucci Christoph Lorenz Rugzan Hussein Hans Doming Alf Trojan and Stefan Nickel3 Abstract Background Measuring change is fundamental to evaluations health services research and quality management. To date the Gold-Standard is the prospective assessment of pre- to postoperative change. However this is not always possible . in emergencies . Instead a retrospective approach to the measurement of change is one alternative of potential validity. In this study the Gold-Standard conventional method was compared with two variations of the retrospective approach a perceived-change design model A and a design that featured observed follow-up minus baseline recall model B . Methods In a prospective longitudinal observational study of 185 hernia patients and 130 laparoscopic cholecystectomy patients T0 7-8 days pre-operative T1 14 days post-operative and T2 6 months post-operative changes in symptoms Hernia 9 Items Cholecystectomy 8 Items were assessed at the three time points by patients and the conventional method was compared to the two alternatives. Comparisons were made regarding the percentage of missing values per questionnaire item correlation between conventional and retrospective measurements and the degree to which retrospective measures either over- or underestimated changes and timedependent effects. Results Single item missing values in model A were more frequent than in model B . Hernia repair at T1 model A model B . In all items and at both postoperative points of measurement correlation of change between the conventional method and model B was higher than between the conventional method and model A. For both models A and B correlation with the change calculated with
