Table 2 Weighted mean differences or odd ratios of outcomes following each analysis comparing FNS to CS
Subgroup and Outcomes | No. of studies | Sample size | WMD or OR (95% CI) | I2, % | P value | |
|---|---|---|---|---|---|---|
| Â | Â | FNS | CS | Â | Â | Â |
Intraoperative indicators | ||||||
 Incision length (cm) | 2 | 75 | 76 | WMD = 0.46 (0.03, 0.89) | 70 | 0.04 |
 Blood loss (ml) | 6 | 164 | 207 | WMD = 21.54 (10.16, 32.91) | 91 |  < 0.001 |
 X-ray exposures (n) | 2 | 62 | 64 | WMD = -10.16 (-11.44, -8.88) | 0 |  < 0.001 |
 Operation time (min) | 7 | 176 | 235 | WMD = -5.32 (-14.32, 3.67) | 93 | 0.25 |
Postoperative clinical indicators | ||||||
 Fracture healing time (mo) | 4 | 119 | 158 | WMD = -1.54 (-2.38, -0.70) | 92 |  < 0.001 |
 Hospital stay (day) | 4 | 120 | 138 | WMD = 0.17 (-0.31, 0.65) | 52 | 0.49 |
 Length of femoral neck shortening (mm) | 3 | 63 | 87 | WMD = -2.01 (-3.11, -0.91) | 0 |  < 0.001 |
Postoperative complications | ||||||
 Nonunion/delayed union (n) | 6 | 161 | 181 | OR = 0.43 (0.16, 1.13) | 0 | 0.09 |
 Femoral head necrosis (n) | 6 | 174 | 193 | OR = 0.27 (0.08, 0.83) | 0 | 0.02 |
 Implant failure/cutout (n) | 4 | 125 | 130 | OR = 0.28 (0.10, 0.82) | 0 | 0.02 |
Postoperative scores | ||||||
 Visual Analog Scale Score | 2 | 54 | 88 | WMD = -1.27 (-2.51, -0.04) | 91 | 0.04 |
 Harris Score | 6 | 164 | 207 | WMD = 4.15 (1.00, 7.30) | 89 | 0.01 |