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Table 2 Median values with interquartile range of plaque index (score 0–3), calculus index (score 0–1), gingiva index (score 0–3), and bleeding index (score 0–3), and mean values with standard deviation of probing depth (in mm) and peri-implant bone level change (in mm) for each group

From: Implant-supported mandibular overdentures: a retrospective case series study in a daily dental practice

  2-implant group
n=61 patients
n=122 implants
3-implant group
n=38 patients
n=113 implants
4-implant group
n=34 patients
n=133 implants
Plaque index [interquartile range] 1 [0;1] 1 [0;1] 1 [0;1]
Calculus index [interquartile range] 1 [0;1] 1 [0;1] 1 [0;1]
Gingiva index [interquartile range] 1 [0;1] 1 [0;1] 1 [0;1]
Bleeding index [interquartile range] 1 [0;1] 1 [0;1] 1 [0;1]
Probing depth (sd) 3.4 (0.9) 3.3 (1.4) 3.9 (1.2)
Peri-implant bone level change (sd) −0.53 (0.69) −0.61 (0.60) −0.40 (0.51)