Author / Year | Country | Sample size | Study design | Age, yr | Main exposure definition | Exposure cut-off point | Accessment of cognitive function | Effect size and crude association results with 95%CI highest vs. lowest category | Effect size and adjusted association results with 95%CI highest vs. lowest category | Adjustment | Quality scores |
---|---|---|---|---|---|---|---|---|---|---|---|
Gil-Montoya et al (2015) [37] | Spain | 409 | Case-control | > 50 | Number of teeth present | 20–32, 10–19, 1–9 | DSM-IV | 1.76 (1.05–2.95) | 1.25 (0.67–2.36) | Age, sex, clinical attachment loss, oral hygiene habits, and hyperlipidemia | 13 |
Gatz et al (2006) [27] | Sweden | 3373 | Case-control | 59–107 | Number of teeth missing | All, Half, Has all teeth | Clinical diagnostic evaluations for dementia | 1.74 (1.35–2.24) | 1.49 (1.14–1.95) | Age, sex, education, mentally stimulating activities, physical exercise, parents’ social class, short adult height | 12 |
Kondo et al (1994) [38] | Japan | 180 | Case-control | 43–89 | Number of teeth missing | More than half of the teeth, Total denture with no own teeth | DSM-III R | 1.90 (1.00–3.60) | – | – | 11 |