TABLE 1.

Prevalence of dementia and mild cognitive impairment by population

Age group (in years)	60‐64	65‐69	70‐74	≥75	Age‐standardized
TSIMANE
N	135	139	82	79	435
% Men	44.4%	54.7%	57.3%	48.1%	50.8%
Dementia
N cases	0	0	0	5	5
Prevalence % (95% CI)	–	–	–	6.3 (2.1, 14.2)	1.2 (0.1, 2.0)
MCI
N cases	1	13	7	14	35
Prevalence % (95% CI)	0.7 (0.0, 4.1)	9.4 (5.1,15.5)	8.5 (3.5, 16.8)	17.7 (10.0, 27.9)	7.7 (5.2, 10.3)
MOSETEN
N	68	50	28	23	169
% Men	52.9%	54.0%	50.0%	56.5%	53.2%
Dementia
N cases	0	0	0	1	1
Prevalence % (95% CI)	–	–	–	4.4 (0.1,22.0)	0.7 (0.0, 2.2)
MCI
N cases	5	4	4	3	16
Prevalence % (95% CI)	7.4 (2.4, 16.3)	8.0 (2.2, 19.2)	14.3 (4.0, 32.7)	13.0 (2.8, 35.6)	9.8 (4.9, 14.6)

Note: 95% Confidence intervals (CIs) for age‐specific estimates are exact binomial. 95% CI for age‐standardized estimates are based on normal distribution. If those who died during the prevalence period are not removed, crude prevalence is 1.1% for Tsimane and 1.2% for Moseten (vs crude prevalence of 1.2% and 0.7% with adjustment for deaths during the prevalence period). One Moseten dementia case was among those who died during the prevalence period.