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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