Table 5

Diseases and disorders associated with the brain by demographic groups

Variable	Characteristics	AD and dementia			Schizophrenia			Depression
Variable	Characteristics	%	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
Education	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
Healthcare experience	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
Variable	Characteristics	%	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
Education	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
Healthcare experience	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
Variable	Characteristics	%	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
Education	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
Healthcare experience	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
Variable	Characteristics	%	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
Education	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
Healthcare experience	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
Variable	Characteristics	%	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
Education	Lower education	4.6	0.94	0.80 to 1.11
Healthcare experience	No	3.4
Healthcare experience	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.