Response shift effect on gastrointestinal quality of life index after laparoscopic cholecystectomy

Shi, Hon-Yi; Lee, King‐Teh; Lee, Hao-Hsien; Uen, Yih-Huei; Chiu, Chong‐Chi

doi:10.1007/s11136-010-9760-z

Cited by 14 publications

(17 citation statements)

References 27 publications

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“…Another factor is age. This study confirmed previous findings that QOL improvement after LC surgery is inversely related to age [18], [27].…”

Section: Discussionsupporting

confidence: 92%

“…Another possible but untested explanation is gender differences in health care received. Some authors also suggest that patient values and the reporting of health status also differ by gender [18], [27]. Another factor is age.…”

Section: Discussionmentioning

confidence: 99%

“…Despite their contribution to the growing understanding of LC surgery outcomes, previous studies of LC outcome have had major shortcomings [12], [17], [18]. Few studies of LC outcome have used longitudinal data for more than two years.…”

Section: Introductionmentioning

confidence: 99%

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Comparisons of Prediction Models of Quality of Life after Laparoscopic Cholecystectomy: A Longitudinal Prospective Study

et al. 2012

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BackgroundFew studies of laparoscopic cholecystectomy (LC) outcome have used longitudinal data for more than two years. Moreover, no studies have considered group differences in factors other than outcome such as age and nonsurgical treatment. Additionally, almost all published articles agree that the essential issue of the internal validity (reproducibility) of the artificial neural network (ANN), support vector machine (SVM), Gaussian process regression (GPR) and multiple linear regression (MLR) models has not been adequately addressed. This study proposed to validate the use of these models for predicting quality of life (QOL) after LC and to compare the predictive capability of ANNs with that of SVM, GPR and MLR.Methodology/Principal FindingsA total of 400 LC patients completed the SF-36 and the Gastrointestinal Quality of Life Index at baseline and at 2 years postoperatively. The criteria for evaluating the accuracy of the system models were mean square error (MSE) and mean absolute percentage error (MAPE). A global sensitivity analysis was also performed to assess the relative significance of input parameters in the system model and to rank the variables in order of importance. Compared to SVM, GPR and MLR models, the ANN model generally had smaller MSE and MAPE values in the training data set and test data set. Most ANN models had MAPE values ranging from 4.20% to 8.60%, and most had high prediction accuracy. The global sensitivity analysis also showed that preoperative functional status was the best parameter for predicting QOL after LC.Conclusions/SignificanceCompared with SVM, GPR and MLR models, the ANN model in this study was more accurate in predicting patient-reported QOL and had higher overall performance indices. Further studies of this model may consider the effect of a more detailed database that includes complications and clinical examination findings as well as more detailed outcome data.

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“…Another factor is age. This study confirmed previous findings that QOL improvement after LC surgery is inversely related to age [18], [27].…”

Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Comparisons of Prediction Models of Quality of Life after Laparoscopic Cholecystectomy: A Longitudinal Prospective Study

et al. 2012

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“…A recent study [27] found that patients who underwent laparoscopic cholecystectomy reported a significantly higher 'Quality of Life' when asked directly before the operation, compared to the retrospective rating of their preoperative 'Quality of Life', which is interpreted as positive response shift. These results are in line with our findings concerning Model B.…”

Section: Discussionmentioning

confidence: 99%

A comparison of conventional and retrospective measures of change in symptoms after elective surgery

Bitzer

Petrucci

Lorenz³

et al. 2011

Health Qual Life Outcomes

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BackgroundMeasuring 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 (e.g. 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).MethodsIn 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 time-dependent effects.ResultsSingle item missing values in model A were more frequent than in model B (e.g. Hernia repair at T1: model A: 23.5%, model B: 7.9%. 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 the conventional method was higher at T1 than at T2. Compared to the conventional model both models A and B also overestimated symptom-change (i.e. improvement) with similar frequency, but the overestimation was higher in model A than in model B. In both models, overestimation was lower at T1 than at T2 and lower after hernia repair than after cholecystectomy.ConclusionsThe retrospective method of measuring change was associated with a larger improvement in symptoms than was the conventional method. Retrospective assessment of change results in a more optimistic evaluation of improvement by patients than does the conventional method (at least for hernia repair and laparoscopic cholecystectomy).

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“…However, there is a risk of bias when relying on self-reporting, as subjects can change internal standards ('recalibration'), shift priorities ('reprioritization'), or reinterpret the same instrument between two different time points ('reconceptualization'). These three biases are known collectively as a 'response shift,' and have been investigated in a number of other specialties including general surgery, oromaxillofacial surgery, and orthopedic surgery [18][19][20]. An analogy of these biases is to compare our outcome questionnaires to an elastic ruler.…”

Section: Introductionmentioning

confidence: 99%

Outcomes of Surgical Treatment of Chronic Rhinosinusitis

DeConde

Alt

2015

Curr Otorhinolaryngol Rep

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Since the introduction of endoscopic sinus surgery (ESS) for treatment of chronic rhinosinusitis (CRS) over 25 years ago, there has been an effort to quantify the effectiveness of this intervention. Within the last few years, the field has matured to a point where study designs are able to accurately capture the impact of ESS relative to continued medical therapy on the CRS disease process and quality-of-life (QOL). These comparative effectiveness studies demonstrate superior effectiveness of ESS over medical therapy at mean reduction of disease burden as measured by comprehensive disease-specific QOL questionnaires. As outcomes from large comparative effectiveness studies accumulates, and a more complete understanding of the many variables that contribute to and influence CRS, the potential to build predictive models based on baseline characteristics might allow for forecasting of treatment successes and failures.

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Response shift effect on gastrointestinal quality of life index after laparoscopic cholecystectomy

Cited by 14 publications

References 27 publications

Comparisons of Prediction Models of Quality of Life after Laparoscopic Cholecystectomy: A Longitudinal Prospective Study

Comparisons of Prediction Models of Quality of Life after Laparoscopic Cholecystectomy: A Longitudinal Prospective Study

A comparison of conventional and retrospective measures of change in symptoms after elective surgery

Outcomes of Surgical Treatment of Chronic Rhinosinusitis

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