Table 2.

Characteristics of included studies

Author	Year *	Country	Age range	No. of Participants	No. of cases of dementia	Crude prevalence rate (IC 95%)	ADI Total Score
# Ravaglia et al. [13]	1999	Italy	≥65	1016	60	5.9 (4.3–7.8)	7
# Tognoni et al. [14]	2000	Italy	≥65	1600	100	6.2 (5.1–7.4)	7.5
# Gascòn-Bayarri et al. [15]	2002	Spain	≥70	1754	165	9.4 (8.0–10.8)	9.5
Fernàndez et al. [16]	2004	Spain	≥65	1931	175	9.1 (7.8–10.3)	5.5
# Fish et al. [17]	2003	UK	65–84	1699	88	5.2 (4.2–6.3)	7.5
Gavrila et al. [18]	2003–2005	Spain	65–96	1074	56	5.5 (4.3–7.1)	5.5
# Bermejo-Pareja et al. [20]	1994–1995 (baseline) 1997–1998 (follow-up)	Spain	≥65	5278	306	5.8 (5.2–6.5)	9
Spada et al. [19]	2005	Italy	60–85	280	20	7.1 (4.1–10.1)	4.5
Nunes et al. [21]	2003–2004	Portugal	55–79	1146	31	2.7 (1.9–3.8)	4.5
Adelman et al. [23]	2007–2008	UK	≥60	436	36	8.3 (5.7–10.8)	5
# Mathillas et al. [24]	2000–2002 and 2005–2007	Sweden	≥85	895	287	32.1 (29.0–35.1)	7
Virués-Ortega et al. [25]	1990–2003	Spain	≥75	546	49	9.0 (6.6–11.4)	6
# Tola-Arribas et al. [29]	2009–2010	Spain	65–104	2170	184	8.5 (7.3–9.7)	8.5
# Lucca et al. [33]	2002–2010	Italy	≥80	2504	894	35.7 (33.9–37.6)	10.5
# Perquin et al. [30]	2008	Luxembourg	>64	1377	53	3.8 (2.8–4.8)	8

^*year in which the study was carried out. ^# Studies included in the meta-analysis.