Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học 'Respiratory Research cung cấp cho các bạn kiến thức về ngành y đề tài: "Incomplete quality of life data in lung transplant research: comparing cross sectional, repeated measures ANOVA, and multi-level analysis. | Respiratory Research BioMed Central Research Open Access Incomplete quality of life data in lung transplant research comparing cross sectional repeated measures ANOVA and multi-level analysis Karin M Vermeulen 1 Wendy J Post1 Mark M Span1 Wim van der Bij2 Gerard H Koeter2 and Elisabeth M TenVergert1 Address 1Office for Medical Technology Assessment University Medical Center Groningen the Netherlands and 2Department of Pulmonary Diseases University Medical Center Groningen the Netherlands Email Karin M Vermeulen - Wendy J Post - Mark M Span - Wim van der Bij - Gerard H Koeter - Elisabeth MTenVergert - Corresponding author Published 08 September 2005 Received 06 June 2005 Respiratory Research 2005 6 101 doi 1465-9921-6-101 Accepted 08 September 2005 This article is available from http content 6 1 101 2005 Vermeulen et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background In longitudinal studies on Health Related Quality of Life HRQL it frequently occurs that patients have one or more missing forms which may cause bias and reduce the sample size. Aims of the present study were to address the problem of missing data in the field of lung transplantation LgTX and HRQL to compare results obtained with different methods of analysis and to show the value of each type of statistical method used to summarize data. Methods Results from cross-sectional analysis repeated measures on complete cases ANOVA and a multi-level analysis were compared. The scores on the dimension energy of the Nottingham Health Profile NHP after transplantation were used
