Psychometric properties of the Global Operative Assessment of Laparoscopic Skills (GOALS) using item response theory

Yusuke Watanabe, Amin Madani, Yoichi M. Ito, Elif Bilgic, Katherine M. McKendy, Liane S. Feldman, Gerald M. Fried, Melina C. Vassiliou

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Background The extent to which each item assessed using the Global Operative Assessment of Laparoscopic Skills (GOALS) contributes to the total score remains unknown. The purpose of this study was to evaluate the level of difficulty and discriminative ability of each of the 5 GOALS items using item response theory (IRT). Methods A total of 396 GOALS assessments for a variety of laparoscopic procedures over a 12-year time period were included. Threshold parameters of item difficulty and discrimination power were estimated for each item using IRT. Results The higher slope parameters seen with “bimanual dexterity” and “efficiency” are indicative of greater discriminative ability than “depth perception”, “tissue handling”, and “autonomy”. Conclusions IRT psychometric analysis indicates that the 5 GOALS items do not demonstrate uniform difficulty and discriminative power, suggesting that they should not be scored equally. “Bimanual dexterity” and “efficiency” seem to have stronger discrimination. Weighted scores based on these findings could improve the accuracy of assessing individual laparoscopic skills.

Original languageEnglish
Pages (from-to)273-276
Number of pages4
JournalAmerican Journal of Surgery
Volume213
Issue number2
DOIs
Publication statusPublished - 01-02-2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Surgery

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