Table 1.

Sample description and factors associated with dementia prevalence

Exposure	Category	Number	Number (%) with dementia	χ2 (df), P value	OR (95% CI)
Age (year)	70–74	676	81 (12.0)		Reference
	75–79	481	113 (23.5)		2.26 (1.65 to 3.09)
	80–84	330	85 (25.8)	163.39 (4), <0.001	2.55 (1.82 to 3.58)
	85–89	184	76 (41.3)		5.17 (3.56 to 7.52)
	90+	161	87 (54.0)		8.64 (5.86 to 12.7)
Gender	Male	806	183 (22.7)		Reference
	Female	1025	259 (25.3)	1.62 (1), 0.203	1.15 (0.93 to 1.43)
Education	None	139	67 (48.2)		Reference
	Primary	1231	315 (25.6)	81.8 (3), <0.001	0.37 (0.26 to 0.53)
	Secondary	253	30 (11.9)		0.15 (0.09 to 0.24)
	Tertiary	124	11 (8.9)		0.11 (0.05 to 0.21)
Ethnicity	African	686	167 (24.3)		Reference
	E Indian	686	184 (26.8)	9.04 (3), 0.029	1.14 (0.89 to 1.45)
	Mixed	412	85 (20.6)		0.81 (0.60 to 1.09)
	Other	48	6 (12.5)		0.44 (0.19 to 1.06)
Occupation	Unskilled	273	58 (21.2)		Reference
	Semiskilled	145	35 (24.1)		1.18 (0.73 to 1.90)
	Skilled	270	65 (24.1)		1.18 (0.79 to 1.76)
	Clerical/professional	423	63 (14.9)	40.2 (6), <0.001	0.65 (0.44 to 0.96)
	Other	459	134 (29.2)		1.53 (1.07 to 2.18)
	Agricultural—self-employed	113	41 (36.3)		2.11 (1.31 to 3.41)
	Agricultural— employed	149	46 (30.9)		1.66 (1.05 to 2.60)
Angina	Absent	1812	435 (24.0)		Reference
	Present	20	7 (35.0)	1.31 (1), 0.253	1.71 (0.68 to 4.30)
Heart disease	Absent	1643	383 (23.3)		Reference
	Present	189	59 (31.2)	5.79 (1), 0.016	1.49 (1.08 to 2.07)
Stroke	Absent	1752	400 (22.8)		Reference
	Present	80	42 (52.5)	36.8 (1), <0.001	3.74 (2.38 to 5.88)
Diabetes	Absent	1250	281 (22.5)		Reference
	Present	582	161 (27.7)	5.83 (1), 0.016	1.32 (1.05 to 1.65)
High cholesterol	Absent	1604	392 (24.4)		Reference
	Present	228	50 (21.9)	0.69 (1), 0.407	0.87 (0.62 to 1.21)
Hypertension	Absent	997	248 (24.9)		Reference
	Present	835	194 (23.2)	0.67 (1), 0.414	0.91 (0.74 to 1.13)