Table 2.

Comparison of baseline values in the imaged versus non-imaged groups

					95% CI for mean difference
	t	df	P-value	Mean difference	Lower	Upper	Cohen's d
Age (years)	192.182	502 488	<0.001	7.475	7.398	7.551	0.923
Diabetes, N*	0.235	1	0.628	−0.01	−0.051	0.031	0.001
Inflammatory condition, N*	163.087	1	<0.001	−0.156	−0.18	−0.132	0.018
Neurological condition, N*	1458.624	1	<0.001	−1.035	−1.091	−0.98	0.057
Medication use, N*	10.149	1	0.001	0.041	0.016	0.066	−0.005
Smoking status (ever smoker), N*	1128.722	1	<0.001	0.333	0.313	0.352	−0.048
Alcohol frequency (≥weekly), N*	4546.902	1	<0.001	−0.903	−0.93	−0.876	0.097
Diastolic blood pressure (mmHg)	−66.757	455 124	<0.001	−3.699	−3.808	−3.591	−0.359
Systolic blood pressure (mmHg)	5.115	455 116	<0.001	0.515	0.318	0.713	0.028
Body mass index	−40.829	497 530	<0.001	−0.959	−1.005	−0.913	−0.200
Good/excellent health, N*	994.52	1	<0.001	−0.407	−0.433	−0.382	0.046
Poor health, N*	247.755	1	<0.001	0.536	0.468	0.603	−0.044
Verbal-numerical reasoning score	58.665	193 423	<0.001	0.680	0.657	0.703	0.318
Log reaction time	68.365	493 482	<0.001	0.065	0.063	0.067	0.339
Reaction time (ms)	59.827	493 482	<0.001	35.251	34.096	36.406	0.297
Log visual memory errors	−26.991	495 485	<0.001	−0.088	−0.095	−0.082	−0.134
Visual memory errors	−30.531	495 485	<0.001	−0.513	−0.545	−0.480	−0.151
Prospective memory, successful on first attempt, N*	47.545	1	<0.001	−0.168	−0.216	−0.12	0.017
Unhappy, N*	133.65	1	<0.001	0.316	0.262	0.37	−0.026
Neuroticism score	−67.671	408 823	< 0.001	−1.08	−1.112	−1.049	−0.33
Self-reported depression, N*	31.989	1	<0.001	−0.112	−0.151	−0.073	0.008

Student’s t-test for continuous variables. For dichotomous variables denoted by N*: t = chi-square x², mean difference = log odds ratio (difference), Cohen’s d = Cramer’s V. Mean difference reflects imaged group (i.e. imaged average—non-imaged average).