Table 5.

Diseases and disorders associated with the brain by demographic groups

Variable	Characteristics	AD and dementia			Schizophrenia			Depression
		%	OR	99% CI	%	OR	99% CI	%	OR	99% CI
Gender	Women	99.4			96.4			95.6
	Men	98.5	0.40	0.29 to 0.56	94.5	0.64	0.54 to 0.75	93.8	0.70	0.60 to 0.81
	Other/undisclosed	100			95.2	0.74	0.25 to 2.18	96.0	1.11	0.34 to 3.61
Age (years)	>60	99.3			95.1			94.2
	41–60	99.4	1.08	0.71 to 1.65	96.6	1.47	1.23 to 1.75	96.1	1.51	1.29 to 1.78
	<40	98.0	0.35	0.23 to 0.51	96.3	1.34	1.06 to 1.69	95.4	1.29	1.05 to 1.59
Education	Higher education	99.3			96.5			95.6
	Lower education	98.6	0.48	0.34 to 0.67	94.5	0.62	0.53 to 0.72	94.0	0.72	0.62 to 0.84
Healthcare experience	No	98.9			95.3			94.6
	Yes	99.5	2.37	1.57 to 3.56	96.9	1.52	1.28 to 1.81	96.0	1.38	1.18 to 1.61

Variable	Characteristics	Bipolar disorder			Anxiety			Addiction
		%	OR	99% CI	%	OR	99% CI	%	OR	99% CI
Gender	Women	93.6			91.4			90.0
	Men	87.3	0.47	0.42 to 0.53	89.4	0.79	0.71 to 0.89	84.4	0.60	0.54 to 0.67
	Other/undisclosed	93.7	1.01	0.39 to 2.60	95.2	1.88	0.64 to 5.55	90.5	1.05	0.48 to 2.31
Age (years)	>60	88.9			89.0			86.6
	41–60	94.6	2.17	1.90 to 2.49	92.6	1.54	1.37 to 1.74	89.8	1.37	1.23 to 1.52
	<40	93.8	1.90	1.59 to 2.26	92.1	1.44	1.23 to 1.70	90.6	1.50	1.29 to 1.74
Education	Higher education	94.0			91.6			90.0
	Lower education	87.0	0.42	0.38 to 0.47	89.1	0.75	0.67 to 0.84	85.0	0.63	0.57 to 0.69
Healthcare experience	No	90.0			90.2			86.0
	Yes	94.7	2.00	1.76 to 2.28	92.0	1.25	1.11 to 1.40	92.4	1.97	1.77 to 2.20

Variable	Characteristics	Stroke			Parkinson’s disease			Migraine
		%	OR	99% CI	%	OR	99% CI	%	OR	99% CI
Gender	Women	89.9			86.9
	Men	82.4	0.53	0.48 to 0.58	84.3	0.81	0.73 to 0.89	83.5
	Other/undisclosed	89.7	0.98	0.46 to 2.08	84.9	0.85	0.45 to 1.62	79.7	0.78	0.71 to 0.85
Age (years)	>60	87.7			86.1			77.6
	41–60	89.3	1.16	1.04 to 1.29	87.5	1.13	1.25 to 1.02	86.0	1.78	1.62 to 1.95
	<40	84.5	0.76	0.67 to 0.87	83.2	0.80	0.71 to 0.91	88.3	2.18	1.91 to 2.48
Education	Higher education	88.3			87.9			84.3
	Lower education	86.7	0.87	0.79 to 0.96	82.1	0.63	0.57 to 0.69	78.6	0.69	0.63 to 0.75
Healthcare experience	No	84.5			83.1			79.5
	Yes	93.0	2.44	2.18 to 2.73	90.9	2.04	1.85 to 2.26	87.2	1.76	1.61 to 1.92

Variable	Characteristics	Cancer			Hypertension			Diabetes
		%	OR	99% CI	%	OR	99% CI	%	OR	99% CI
Gender	Women	33.8			33.7			16.7
	Men	27.9	0.76	0.70 to 0.82	26.5	0.71	0.66 to 0.77	13.8	0.80	0.73 to 0.88
	Other/undisclosed	37.3	1.16	0.72 to 1.88	41.3	1.38	0.86 to 2.20	25.4	1.70	1.00 to 2.89
Age (years)	>60	28.5			34.2			15.3
	41–60	34.1	1.30	1.21 to 1.40	31.5	0.88	0.82 to 0.95	17.2	1.15	1.05 to 1.27
	<40	38.2	1.55	1.41 to 1.70	25.4	0.65	0.59 to 0.72	14.7	0.96	0.84 to 1.09
Education	Higher education	34.2			33.5			17.3
	Lower education	27.7	0.74	0.68 to 0.79	27.9	0.77	0.71 to 0.83	12.8	0.70	0.64 to 0.77
Healthcare experience	No	27.4			24.9			10.6
	Yes	39.7	1.74	1.63 to 1.87	42.6	2.24	2.09 to 2.39	24.3	2.71	2.49 to 2.96

Variable	Characteristics	Arthritis
		%	OR	99% CI
Gender	Women	5.1
	Men	3.9	0.75	0.63 to 0.89
	Other/undisclosed	6.3	1.25	0.49 to 3.23
Age (years)	>60	4.5
	41–60	5.2	1.15	0.98 to 1.35
	<40	4.6	1.01	0.81 to 1.25
Education	Higher education	4.9
	Lower education	4.6	0.94	0.80 to 1.11
Healthcare experience	No	3.4
	Yes	7.0	2.12	1.83 to 2.46

Univariate OR and 99% CI.

% indicates proportion of participants rating this disorder or disease as ‘associated with the brain’, with the remainder of participants rating it as ‘not associated with the brain’.

AD, Alzheimer’s disease.