Table 2: Factors associated with all-cause dementia prevalence.

Coefficient
( value)
95% confidence interval

Age group
 65–69 (reference)0
 70–791.24 (<0.0001) 1.14–1.34
 80–892.62 (<0.0001) 2.52–2.71
 90 and +3.51 (<0.0001) 3.41–3.62
Sex
 Women (reference)0
 Men−0.01 (0.50)−0.06–0.03
Study name (year)
 Hisayama 19850.16 (0.25) −0.11–0.43
 Hisayama 1992−0.02 (0.85) −0.26–0.21
 Okinawa 1992  (reference) 0
 Hiroshima 1996 0.30 (0.0002) 0.14–0.46
 Hisayama 1998 0.08 (0.39) −0.11–0.28
 Tajiri 1998 0.37 (<0.0001) 0.19–0.55
 Hisayama 2005 0.49 (<0.0001) 0.35–0.64
 Ama-cho 2008 0.27 (0.007) 0.07–0.47

Results are based on a Poisson regression model where all study data are included in one model, with the Okinawa study being a reference.
**Significant at .