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Table 1 Studies’ description

From: Association between residual teeth number in later life and incidence of dementia: A systematic review and meta-analysis

Study Publishing year Country, setting Years of observation Minimum age at enrollment, mean age upon study completion Study participants at enrollment, n Excluded or lost participants, n (%)
Takeuchi et al. [22] 2017 Japan, Hisayama community 5.4 60 1996 430 (21.5%)
Komiyama et al. [23] 2016 Japan, Tsurugaya district community 8 70, 75.2 948 114 (12.0%)
Stewart et al. [24] 2015 Sweden, Gothenburg community 32 70 697 29% in 2000–2001 cohort; 30% in 2005–2006 cohort
Luo et al. [25] 2015 China, Jing’ansi community 3 60, 71.3 3836 3063 (20.1%)
Batty et al. [10] 2013 20 Countries, 215 centers 5 55, 66.2 11,140 1571 (14.1%)
Paganini-Hill et al. [26] 2012 United States, Retirement community 18 52, 80.3 8403 2762 (32.8%)
Yamamoto et al. [27] 2012 Japan, Aichi community 3.7 65 4898 473 (9.6%)
Arrivé et al. [20] 2011 France, Gironde and Dordogne communities 15 66,71.9 447 42 (9.4%)
Kim et al. [11] 2007 Korea, Kwangju community (10/66 Dementia Research Group) 2.4 65, 73.4 919 233 (25.3%)
Stein et al. [21] 2007 United States, Nun community 12 75, 83.0 144 24 (16.7%)
Shimazaki et al. [28] 2001 Japan, 29/30 institutions in Kitakyushu 7 59, 79.7 719 236 (32.8%)