Table 3 Correlation between clinical outcome and patient characteristics

Gender

r =  − 0.020

r =  − 0.056

p = 0.787

p = 0.445

Age (yr)

r =  − 0.031

r = 0.013

p = 0.673

p = 0.854

BMI (Kg/m²)

r = 0.025

r = 0.055

p = 0.733

p = 0.454

Follow-up (yr)

r = 0.044

r = 0.125

p = 0.544

p = 0.087

Osteoporosis

r = 0.171

r = 0.061

p = 0.019

p = 0.403

Pfirrmann

r = 0.173

r = 0.236

p = 0.018

p = 0.001

Distance (mm)

r =  − 0.183

r =  − 0.213

p = 0.012

p = 0.003

Horizontal screw angle (°)

r =  − 0.023

r = 0.044

p = 0.750

p = 0.551

Sagittal screw angle (°)

r = 0.294

r = 0.329

p < 0.001

p < 0.001

PI-LL (°)

r =  − 0.049

r =  − 0.019

p = 0.502

p = 0.795

SS (°)

r =  − 0.253

r =  − 0.141

p < 0.001

p = 0.053

PT (°)

r =  − 0.027

r = 0.067

p = 0.709

p = 0.361