Table 2.

Correlation between screw insertion torque and pullout strength in different groups

	r	P
Correlation between MIT and MPOS of the screw in control group (n = 30)	r = 0.794	P = 0.000
Correlation between MIT with the screw first insertion and MPOS in reinsertion group (n = 30)	r = 0.761	P = 0.000
Correlation between MIT of the screw reinsertion and MPOS in reinsertion group (n = 30)	r = 0.547	P = 0.002
Correlation between MIT of the screw first insertion and MIT of the screw reinsertion in reinsertion group (n = 30)	r = 0.623	P = 0.000
Correlation between MIT and MPOS of the screw in test group (n = 20)	r = 0.824	P = 0.000
Correlation between MIT and MPOS of the revision screw for failed cervical vertebrae screw (n = 20)	r = 0. 633	P = 0.000