***TASK***
the task is to simplify the input abstract of a biomedical literature

***INPUT***
the input is the abstract of a biomedical literature

***OUTPUT***
the output is the simplified abstract for the input abstract of a biomedical literature

***DOCUMENTATION***

***EXAMPLES***

Input: We included eight trials covering 109 surgical trainees with limited laparoscopic experience. Of the eight trials, six compared virtual reality versus no supplementary training. One trial compared virtual reality training versus box-trainer training and versus no supplementary training, and one trial compared virtual reality training versus box-trainer training. There were no trials that compared different forms of virtual reality training. All the trials were at high risk of bias. Operating time and operative performance were the only outcomes reported in the trials. The remaining outcomes such as mortality, morbidity, quality of life (the primary outcomes of this review) and hospital stay (a secondary outcome) were not reported. Virtual reality training versus no supplementary training: The operating time was significantly shorter in the virtual reality group than in the no supplementary training group (3 trials; 49 participants; MD -11.76 minutes; 95% CI -15.23 to -8.30). Two trials that could not be included in the meta-analysis also showed a reduction in operating time (statistically significant in one trial). The numerical values for operating time were not reported in these two trials. The operative performance was significantly better in the virtual reality group than the no supplementary training group using the fixed-effect model (2 trials; 33 participants; SMD 1.65; 95% CI 0.72 to 2.58). The results became non-significant when the random-effects model was used (2 trials; 33 participants; SMD 2.14; 95% CI -1.29 to 5.57). One trial could not be included in the meta-analysis as it did not report the numerical values. The authors stated that the operative performance of virtual reality group was significantly better than the control group. Virtual reality training versus box-trainer training: The only trial that reported operating time did not report the numerical values. In this trial, the operating time in the virtual reality group was significantly shorter than in the box-trainer group. Of the two trials that reported operative performance, only one trial reported the numerical values. The operative performance was significantly better in the virtual reality group than in the box-trainer group (1 trial; 19 participants; SMD 1.46; 95% CI 0.42 to 2.50). In the other trial that did not report the numerical values, the authors stated that the operative performance in the virtual reality group was significantly better than the box-trainer group. Virtual reality training appears to decrease the operating time and improve the operative performance of surgical trainees with limited laparoscopic experience when compared with no training or with box-trainer training. However, the impact of this decreased operating time and improvement in operative performance on patients and healthcare funders in terms of improved outcomes or decreased costs is not known. Further well-designed trials at low risk of bias and random errors are necessary. Such trials should assess the impact of virtual reality training on clinical outcomes.
Output:

Two authors searched the medical literature available until July 2012 and obtained the information from the identified trials. The use of two authors to identify studies and obtain information decreases the errors in obtaining the information. We identified and included eight trials covering 109 surgical trainees in this review. The trials compared virtual reality with no supplementary training or with box-trainer training (physical simulator using a camera to display the inside of the box and instruments). There were no trials that compared different forms of virtual reality training. All the trials were at high risk of bias (defects in study design that can lead to arriving at wrong conclusions with overestimation of benefits and underestimation of harms of virtual reality training or standard training). Operating time and operative performance were the only outcomes reported in the trials. The remaining outcomes such as death, complications, quality of life, and hospital stay after the operation were not reported in any of the trials. Overall virtual reality training appears to decrease the operating time (by about 10 minutes) and improve the operative performance of surgical trainees (difficult to quantify from the available reports) with limited laparoscopic experience when compared with no supplementary training or with box-trainer training. However, the impact of this decreased operating time and improvement in operative performance on patients or healthcare funders in terms of improved health or decreased costs is not known. Further well-designed trials are necessary, with less risk of arriving at wrong conclusions because of poor study design or because of chance. Such trials should assess the impact of virtual reality training on patients and healthcare funders.