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Table 3 Comparison of top 4 sonographers to all others

From: Factors affecting perception of the normal pediatric appendix on sonography

 Top 4 sonographers, N = 50All others, N = 77p value
US result appendix normal, n (%)44 (88.0)16 (20.8)< 0.001
Appendix not visualized, n (%)6 (12.0)61 (79.2) 
Years of experience, median (25th, 75th percentile)15 (9, 15)8 (3, 14)< 0.001
  1. The p value is based on the Pearson Chi-square test and the Mann–Whitney U