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Table 3 Median and interquartile range of risk estimates stratified by response to patient survey question related to the SURPAS tool

From: The value of the “Surgical Risk Preoperative Assessment System” (SURPAS) in preoperative consultation for elective surgery: a pilot study

Questiona   30-day mortality Overall morbidity Unplanned Readmission
N Median (IQR) P value† Median (IQR) P value† Median (IQR) P value†
Was the surgical risk provided from SURPAS:
 The same 70 0.1 (< 0.1–0.3) 0.58 2.7 (1.6–6.6) 0.74 2.3 (1.6–5.1) 0.88
 Less 42 0.1 (< 0.1–0.2)   3.5 (1.7–6.5)   2.8 (1.3–4.9)  
 Greater than you expected it to be 21 0.1 (< 0.1–0.6)   5.0 (1.5–8.7)   3.2 (1.7–5.9)  
 Missingb 47       
On a scale of 1–4, please circle the number that best reflects your opinion of the risk document given to you?
 It was not helpful 0 0 (0–0) 0.94 0 (0–0) 0.72 0 (0–0) 0.78
 It was somewhat helpful 6 0.1 (< 0.1–1.1)   2.0 (1.1–12.3)   2.0 (1.2–7.5)  
 It was helpful 51 0.1 (< 0.1–0.4)   3.3 (1.5–10.5)   2.6 (1.5–5.4)  
 It was very helpful 99 0.1 (< 0.1–0.3)   3.5 (1.7–6.9)   3.0 (1.8–5.1)  
 Missingb 24       
Did seeing the risks make you want to talk to the provider more about your surgery?
 No 115 0.1 (< 0.1–0.3) 0.07 2.9 (1.5–6.5) 0.06 2.3 (1.6–5.0) 0.28
 Yes 25 0.2 (< 0.1–0.5)   4.0 (2.6–11.5)   3.3 (1.8–6.1)  
 Missingb 40       
Did using the SURPAS tool and seeing the personal risks affect your decision to have or not have the operation?
 No 133 0.1 (< 0.1–0.3) 0.30 3.3 (1.6–8.2) 0.40 2.6 (1.7–5.5) 0.26
 Yes 27 0.1 (0.1–0.3)   3.9 (1.9–8.9)   3.3 (1.9–5.5)  
 Missingb 20       
  1. aAbbreviations: IQR interquartile range, SURPAS Surgical Risk Preoperative Assessment System
  2. bMissing was due to no responses to the survey for the given question
  3. †Since the risk estimates were skewed, the P values were calculated by Wilcoxon rank sum and bolded when less than 0.05