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Table 7 Survival regression coefficient per variable

From: Survival of conventional dental implants in the edentulous atrophic maxilla in combination with zygomatic implants: a 20-year retrospective study

Variable Comparison Survival regression coefficient p
Age at baseline > 60 vs. ≤ 60 years 0.394 0.319
Sex Female vs. male 0.370 0.317
Smoking No vs. yes 0.221 0.639
Bruxism No vs. yes 1.309 0.015*
Indication First- vs. re-treatment 0.570 0.226
Mandible Prothesis vs. teeth 0.680 0.078
Surgeon experience 5–10 years vs. < 5 years 0.156 0.784
5–10 years vs. ≥ 10 years 0.434 0.631
 ≥ 10 years vs. < 5 years − 0.278 0.784
Anterior implants 2 vs. 3 anterior implants 0.662 0.630
2 vs. 4 anterior implants 0.551 0.618
3 vs. 4 anterior implants 0.112 0.977
Maxilla Fixed bridge vs. overdenture 0.906 0.030*
Implant length  > 10 mm vs. ≤ 10 mm 0.563 0.048*
Implant locus 1 vs. 2 − 0.012 0.999
1 vs. 3 − 0.102 0.915
1 vs. 4 − 0.627 0.738
2 vs. 3 − 0.090 0.991
2 vs. 4 − 0.615 0.779
3 vs. 4 − 0.525 0.831
  1. *Significant