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Table 1 Frequency distributions and comparisons of baseline patient characteristics and local clinical features of the study groups

From: Postsurgical oral symptoms after insertion of one or two implants for mandibular overdentures: short-term results of a randomized clinical trial

  Overall (n = 47) 1-IOD (n = 23) 2-IOD (n = 24) p-value
Age in yearsa 65.4 (8.6) 66.9 (7.0) 64.0 (9.8) 0.253
Gender (female) 35 (74.5) 15 (65.2) 20 (83.3%) 0.154
Diabetes 18 (38.3) 9 (39.1) 9 (37.5) 0.908
Smokers and former smokers 28 (59.6) 13 (56.5) 15 (62.5) 0.676
Classification of residual ridge forms
 Well-rounded 3 (6.4) 2 (8.7) 1 (4.2) 0.175
 Knife-edge 19 (40.4) 6 (26.1) 13 (54.2)  
 Flat ridge 8 (17.0) 6 (26.1) 2 (8.3)  
 Depressed 17 (36.2) 9 (39.1) 8 (33.3)  
Keratinized tissue width (KTW) a
 Buccal 2.02 (1.44) 1.76 (1.18) 2.27 (1.65) 0.230
 Lingual 1.88 (1.33) 1.48 (1.03) 2.27 (1.49) 0.040
 Crestal 1.85 (0.91) 1.72 (0.89) 1.98 (0.94) 0.332
Vertical mucosa thickness (VMT) a
 Buccal 2.20 (0.91) 2.35 (0.93) 2.05 (0.88) 0.271
 Lingual 1.97 (1.05) 2.30 (1.21) 1.61 (0.72) 0.026
 Crestal 2.32 (0.86) 2.33 (0.94) 2.31 (0.79) 0.941
Height of the anterior mandible (mm)a 27.7 (3.6) 28.3 (3.5) 27.2 (3.6) 0.278
PDI classification
 II 2 (4.3) 2 (8.7) 0 (0) 0.275
 III 40 (85.1) 18 (78.3) 22 (91.7)  
 IV 5 (10.6) 3 (13.0) 2 (8.3)  
  1. aMean (and standard deviation)