Challenges in analysis and interpretation of cost data in vascular surgery Kevin Mani, MD, Jonas Lundkvist, RPh, PhD, Lars Holmberg, MD, PhD, Anders Wanhainen,

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Presentation transcript:

Challenges in analysis and interpretation of cost data in vascular surgery Kevin Mani, MD, Jonas Lundkvist, RPh, PhD, Lars Holmberg, MD, PhD, Anders Wanhainen, MD, PhD Journal of Vascular Surgery Volume 51, Issue 1, Pages 148-154 (January 2010) DOI: 10.1016/j.jvs.2009.08.042 Copyright © 2010 Society for Vascular Surgery Terms and Conditions

Fig 1 Schematic histograms illustrate the relationship of mean and median values to the total in (A) a normal and (B) a skewed distribution. Journal of Vascular Surgery 2010 51, 148-154DOI: (10.1016/j.jvs.2009.08.042) Copyright © 2010 Society for Vascular Surgery Terms and Conditions

Fig 2 Schematic presentation shows the bootstrap simulation technique. Journal of Vascular Surgery 2010 51, 148-154DOI: (10.1016/j.jvs.2009.08.042) Copyright © 2010 Society for Vascular Surgery Terms and Conditions

Fig 3 Box-and-whisker plots and histograms of the cost of abdominal aortic aneurysm repair with open repair (OR) and endovascular repair (EVAR) using a population-based study8. (A) total, (B) preoperative, (C) perioperative, and (D) postoperative cost. In the box-and-whisker plots (left in each figure), the box indicates the interquartile range (IQR; left line is the lower quartile [Q1], middle line is the median, right line is the upper quartile [Q3]); the whiskers indicate the smallest and largest non-outlier observations within 1.5 IQR below Q1 or above Q3. The black circles (•) indicate mild outlier (1.5-3 IQR below Q1 or above Q3). The asterisk (*) shows an extreme outlier (>3 IQR below Q1 or above Q3). In the histograms (right in each figure) staples indicate the number of observations (N) in a specific cost interval. The full line indicates the mean; dashed lines indicate the 95% confidence interval. N, Number of observations in each interval. Journal of Vascular Surgery 2010 51, 148-154DOI: (10.1016/j.jvs.2009.08.042) Copyright © 2010 Society for Vascular Surgery Terms and Conditions

Fig 4 Histograms show the total cost of abdominal aortic aneurysm repair based on a population-based study.8 Distribution of original cost data, logarithm of cost data, and bootstrap simulation of mean cost are presented. N, Number of observations in each interval. Journal of Vascular Surgery 2010 51, 148-154DOI: (10.1016/j.jvs.2009.08.042) Copyright © 2010 Society for Vascular Surgery Terms and Conditions