Table 1. Details of the included teeth.

Variables		All teeth	Teeth with a vertical height of the alveolar bone <10 mm
Sex
	Male (n=105)	−1.36±4.01	−0.66±3.99
	Female (n=71)	−1.86±3.82	−1.39±3.91
Number of extracted teeth
	Single extraction (n=98)	−2.09±3.11	−1.67±2.99
	Multiple extraction (n=78)	−0.89±4.17	−0.13±4.73
Tooth site
	First premolar (n=21)	−0.34±3.88	1.53±3.67
	Second premolar (n=34)	−0.78±3.07	−0.58±3.19
	First molar (n=89)	−1.9±4.02	−1.28±3.98
	Second molar (n=32)	−2.25±4.39	−1.81±4.46
Reason for extraction
	Periodontal (n=141)	−1.79±3.56	−1.15±3.51
	Endodontic (n=9)	−2.28±2.37	−2.28±2.37
	Fracture (n=17)	−0.78±4.73	−0.20±4.76
	Unknown (n=9)	1.2±7.39	2.22±8.10
Time interval following tooth extraction
	≤6 months (n=90)	−1.91±3.77	−1.28±3.74
	>6 and ≤12 months (n=51)	−1.04±3.66	−0.23±3.40
	>12 months (n=35)	−1.41±4.69	−1.15±5.01
Relationship between the root and the sinus floor
	Class I (n=73)	−2.12±3.95	−0.81±3.78
	Class II (n=51)	−1.49±3.66	−1.39±3.8
	Class III (n=27)	−0.55±3.96	−0.17±4.18
	Class IV (n=12)	−1.5±3.35	−1.5±3.35
	Class V (n=12)	−0.8±5.46	−0.8±5.46
Sinus mucosal thickening
	≤5 mm (n=130)	−1.43±3.32	−0.79±3.15
	>5 and ≤10 mm (n=34)	−1.61±5.24	−1.11±5.62
	>10 mm (n=12)	−2.84±5.74	−2.08±5.35