Table 7 Survival regression coefficient per variable

Age at baseline

> 60 vs. ≤ 60 years

Sex

Female vs. male

Smoking

No vs. yes

Bruxism

No vs. yes

Indication

First- vs. re-treatment

Mandible

Prothesis vs. teeth

Surgeon experience

5–10 years vs. < 5 years

5–10 years vs. ≥ 10 years

 ≥ 10 years vs. < 5 years

Anterior implants

2 vs. 3 anterior implants

2 vs. 4 anterior implants

3 vs. 4 anterior implants

Maxilla

Fixed bridge vs. overdenture

Implant length

 > 10 mm vs. ≤ 10 mm

Implant locus

1 vs. 2

1 vs. 3

1 vs. 4

2 vs. 3

2 vs. 4

3 vs. 4