Fig. 1

Performance of the three laparoscopic exercises for the control group and five intervention groups (earplug, SPL 50–80 dB). a. Exercise (a), “Pack your luggage”; mean values of the required times are shown on the ordinate with their 25 and 75% quartiles against the respective groups on the abscissa; p-values for the comparisons between each group are shown below; ° = outlier. b. Exercise (b), “Chinese Jump Rope”. Mean values of the required times are shown on the ordinate with their 25 and 75% quartiles against the respective groups on the abscissa; p-values for the comparisons between each group are shown below; ° = outlier. c. Exercise (c), “Weaving”. Mean values of the required times are shown on the ordinate with their 25 and 75% quartiles against the respective groups on the abscissa; p-values for the comparisons between each group are shown below; ° = outlier