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Table 3 In-vivo Experiments Section data. Continuous variables with non-normal variables were reported as median (Lower Quartile; Upper Quartile),and categorical data were analyzed using Fisher’s exact test or χ2 tests

From: Comparison of freehand technique and a novel laser-guiding navigation system in femoral neck-cannulated screw fixation: a randomized controlled trial

Operative and postoperative data

Laser group (n = 15)

FH group (n = 15)

Z/χ2

P value

Operative time(min)

45 (40–45)

70 (65–75)

4.62

< 0.0001

Radiation exposure time(Sec)

35 (35–40)

110 (95–125)

4.68

< 0.0001

Amount of bleeding (ml)

30 (20–35)

50 (40–50)

3.97

< 0.0001

Preoperative VAS score

8 (8–9)

8 (8–9)

0.95

0.34

Postoperative VAS score

2 (2–2)

2 (2–2)

1.31

0.18

First success rate

    

 No

1 (6.67)

6 (40)

4.65

0.03

 Yes

14 (93.33)

9 (60)

  

Harris score

87 (85–89)

87 (85–89)

0.16

0.86

Fracture healing time(week)

13 (12–15)

14 (13–15)

0.89

0.37