Table 5 Univariate linear regression analysis for MBL

Cantilever

 No

y = − 0.37 − 0.00725x

0.003

0.337

 Yes

y = − 0.40 − 0.00930x

0.473

Age (years)

 < 56

y = − 042 − 0.00735x

0.336

 56.0–65.9

y = − 0.38 − 0.00692x

0.001

0.401

 ≥ 66

y = − 0.29 − 0.01000x

0.383

Sex

 Male

y = − 0.36 − 0.00626x

< 0.001

0.356

 Female

y = − 0.39 − 0.00949x

0.409

Jaw

 Maxilla

y = − 0.35 − 0.00997x

0.978

0.408

 Mandible

y = − 0.38 − 0.00700x

0.357

Jaw position

 Anterior

y = − 0.50 − 0.00815x

0.677

0.233

 Posterior

y = − 0.38 − 0.00764x

0.370

Implant surface

 Turned

y = − 0.41 − 0.00702x

< 0.001

0.350

 Modified

y = − 0.30 − 0.01000x

0.387

Implant diameter

 < 3.75 mm

y = − 0.27 − 0.01000x

0.996

0.370

 3.75 mm

y = − 0.30 − 0.00811x

0.342

 > 3.75 mm

y = − 0.30 − 0.00811x

0.551

Bone quantity

 A–B

y = − 0.35 − 0.00727x

0.002

0.355

 C–D–E

y = − 0.43 − 0.00870x

0.394

Bone quality

 1–2

y = − 0.34 − 0.00747x

0.011

0.370

 3–4

y = − 0.41 − 0.00776x

0.355

Smoking^c

 No

y = − 0.44 − 0.00696x

0.451

0.350

 Yes^d

y = − 0.30 − 0.00933x

0.379

Bruxism^c

 No

y = − 0.32 − 0.00682x

0.006

0.479

 Yes

y = − 0.43 − 0.00745x

0.344

Diabetes

 No

y = − 0.40 − 0.00797x

0.739

0.371

 Yes

y = − 0.47 − 0.00483x

0.298