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Table 4 Results of the meta-analysis

From: Comparison of efficacy of robotic surgery, laparoscopy, and laparotomy in the treatment of ovarian cancer: a meta-analysis

Variable Sample size Test of association Model Test of heterogeneitya,b Egger’s testc
N1 N2 WMD/OR (95% CI) Z P Q P I2 (%) t P
R vs. L            
EBL 96 79 − 55.0871 [− 139.0087; 28.8345] 1.29 0.1983 R 8.83 0.07 54.7 0.3887 0.7234
LHS 96 79 − 1.4296[− 3.5326; 0.6734] 1.33 0.1827 R 13.06 0.01 69.4 0.9334 0.4195
OT 104 90 − 0.8561[− 46.3735; 44.6612] 0.04 0.9706 R 13.4 < 0.01 70.2 0.7602 0.5024
PC 144 166 1.4541 [0.6502; 3.2516] 0.91 0.3619 F 5.34 0.38 6.3 1.5330 0.2001
PN 78 58 − 0.5664 [− 3.1615; 2.0288] 0.43 0.6688 F 2.78 0.25 28.2 0.7882 0.5751
PR 26 32 0.2387 [0.0445; 1.2792] 1.67 0.0944 F 1.34 0.25 25.5 NA NA
OS rate 60 44 2.2000 [0.0842; 57.4835] 0.47 0.6360 NA NA NA NA NA NA
DFS rate 60 44 1.6909 [0.2572; 11.1175] 0.55 0.5850 F 0.05 0.83 0.0 NA NA
R vs. O            
EBL 125 274 − 521.7027 [− 809.7816; − 233.6238] 3.55 0.0004 R 82.54 < 0.01 93.9 1.1403 0.3178
LHS 159 274 − 5.2225 [− 6.1485; − 4.2965] 11.05 < 0.0001 F 8.36 0.14 40.2 0.1786 0.8669
OT 151 259 9.8527 [− 57.0904; 76.7958] 0.29 0.7730 R 59.75 < 0.01 93.3 0.5645 0.6119
PC 159 274 0.4710 [0.2537; 0.8747] 2.38 0.0171 F 1.77 0.88 0.0 6.8290 0.0024
PN 141 226 0.0048 [− 1.9418; 1.9514] <0.01 0.9962 F 4.77 0.19 37.1 0.2131 0.8510
PR 73 59 0.8506 [0.3356; 2.1562] 0.34 0.7332 F 1.71 0.19 41.7 NA NA
OS rate 107 99 6.4355 [1.6722; 24.7678] 2.71 0.0070 F 0.09 0.76 0.0 NA NA
  1. WMD weighted mean difference, OR odds ratio, CI confidence interval, EBL estimated blood loss, LHS length of hospital stay, OT operating time, PC postoperative complication, PN pelvic nodes, PR postoperative recurrence, OS overall survival, DFS disease-free survival, NA data are not available
  2. aRandom effects model was used when the P for heterogeneity test < 0.05; otherwise, the fixed effect model was used
  3. bP < 0.05 is considered statistically significant for Q test
  4. cEgger’s test to evaluate publication bias, P < 0.05 is considered statistically significant