Anne van Dalen

196 I Chapter 7 The ORBB The question “Do you believe that the use of a Black Box- a medical data recorder- in the OR could contribute to the patient safety” was answered with an overall mean of 3.05 (SD 1.12, 5-point Likert scale, N=126). Eighteen subjects (out of 81 total participants in the ORBB trial) participated in the Black Box trial of which 6 operating nurses, 5 anaesthesiologists, 4 anaesthesia nurses, and 3 surgeons. Concerning the means of the 11 patient safety dimensions, overall perception of patient safetywas the only dimension for which the overall meanwas significantly different (P-value 0.03) between those who did participate in the ORBB Trial (mean 2.85, SD 0.43) and those who did not participate (mean 3.09, SD 0.45). Table 3 demonstrates the means of all the 11 dimensions between participants and non-participants of the ORR trial. Working more than 40 hours per week seems to influence the attitude towards patient safety. Overall, 44.4% of the ORBB participants work 20-40 hours per week and 38.9% of them work more than 40 hours per week. Participating in ORBB trial and hours working per week both appeared to be significantly correlated with the overall attitude towards patient safety, when correcting for possible confounders (Table 4).