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Table 2 Linear mixed model for apical bone changes as dependent variable and possible independent influencing variables and ‘patient’ and ‘implant number’ as random effects (the end model after selection process is shown)

From: Long-term apical bone gain after implant placement combined with internal sinus-floor elevation without graft

Variable Estimate 95% CI LB 95% CI UB P value
Mesial
 Visit time (T0-T6) 0.2558 0.2068 0.3047 0.0000
 Baseline bone height −0.7880 − 0.8583 − 0.7178 0.0000
 Implant length 10 mm 1.3866 0.7024 2.0707 0.0001
 Implant length 12 mm 2.4587 1.6105 3.3069 0.0000
Distal
 Visit time (TO-T6) 0.2366 0.1868 0.2864 0.0000
 Baseline Bone height −0.7637 −0.8535 − 0.6739 0.0000
 Implant length 10 mm 1.6216 0.8308 2.4123 0.0001
 Implant length 12 mm 2.8623 0.1.885 3.8360 0.0000
  1. Legend: T visit time, CI confidence interval, LB lower border, UB upper border
  2. The non-significant variables were removed from the table in terms of clarity