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Table 2 Matrix of Spearman correlation coefficients and P values (in brackets) for the association among assessment methods of bone quality (intra-surgical tactile perception, preoperative CT visual evaluation, preoperative CT mean gray values (MGVs)) and primary stability (insertion torque)

From: Relation between insertion torque and tactile, visual, and rescaled gray value measures of bone quality: a cross-sectional clinical study with short implants

Variables Torque Tactile CT visual MGV_avg MGV_axial MGV_cor MGV_sag
Torque − 0.770 (< 0.001) − 0.415 (0.017) 0.677 (< 0.001) 0.620 (< 0.001) 0.629 (< 0.001) 0.607 (< 0.001)
Tactile − 0.770 (< 0.001) 0.342 (0.052) − 0.670 (< 0.001) − 0.643 (< 0.001) − 0.697 (< 0.001) − 0.469 (0.006)
CT visual − 0.415 (0.017) 0.342 (0.052) − 0.516 (0.002) − 0.518 (0.002) − 0.483 (0.005) − 0.421 (0.015)
MGV_avg 0.677 (< 0.001) − 0.670 (< 0.001) − 0.516 (0.002) 0.970 (< 0.001) 0.939 (< 0.001) 0.848 (< 0.001)
MGV_axial 0.620 (< 0.001) − 0.643 (< 0.001) − 0.518 (0.002) 0.970 (< 0.001) 0.926 (< 0.001) 0.741 (< 0.001)
MGV_coronal 0.629 (< 0.001) − 0.697 (< 0.001) − 0.483 (0.005) 0.939 (< 0.001) 0.926 (< 0.001) 0.671 (< 0.001)
MGV_sagittal 0.607 (< 0.001) − 0.469 (0.006) − 0.421 (0.015) 0.848 (< 0.001) 0.741 (< 0.001) 0.671 (< 0.001)