Table 5. Study Characteristics (OSTEOPOROSIS).

Author (Year)	Country	Study	Follow-up	Patient Characteristics			Implant Characteristics			QS
				Mean Age	CON/STY	F	CON/STY	Position (Mand./Max.)	FC/FS
Amorim,2007	Brazil	Retro	9 m	58.2 yr	20/19	39	43/39	Mandible	0/1	8
Alsaadi,2008	Belgium	Retro	2 yr	NA	393/19	240	1,446/68	698/816	92/9	8
Holahan,2008	USA	Retro	5.4 yr	63±9 yr	564/192	746	306/340	378/268	17/20	7
Dvorak,2011	Austria	Retro	6±4 yr	≥45 yr	115/62	117	543/258	396/432	17/20	7

CON = control group, that is non-osteoporosis group; STY = study group, that is osteoporosis group; F = Female; Mand. = mandible; Max. = maxilla; Retro = retrospective study; Prospec = prospective study; yr = year; m = month; NA = not available; Local = local bone; Grafted = grafted bone; FC = failure implant number of Control Group; FS = failure implant number of Study Group; QS = quality assessment score.