Table 1.

Demographic information for men and women at initial MRI (mean±SD and N)

		3.0T		1.5T		1.5T + 3.0T
		Men	Women	Men	Women	Men	Women
Age at 1st MRI	mean =	47.9	45.2	43.6	52.4	46.8	48.0
	SD=	16.0	21.3	16.9	11.5	13.1	18.4
	range=	22–80	20–85	20–71	29–72	20–80	20–85
	N =	41	41	14	26	55	67
Age at 2nd MRI	mean=	49.6	47.0	45.1	54	48.5	49.7
	SD=	16.0	21.5	17.1	11.7	16.2	18.6
	range=	24–82	21–87	20–73	29–74	20–82	21–87
	N =	41	41	14	26	55	67
Age at 3rd MRI	mean =	53.6	46.8	41.8	55.8	50.7	49.3
	SD=	15.7	25.5	19.0	15.3	17.0	23.2
	range=	26–78	21–86	22–74	33–74	22–78	21–86
	N =	18	16	6	6	24	22
Age at 4th MRI	mean=	56.2	43.5	45.6	54.2	55.3	46.2
	SD=	18.3	26.5	–	18.3	17.7	24.4
	range=	26–79	23–83	45	54–72	26–79	23–83
	N =	10	9	1	2	11	12
Age at 5th MRI	mean=	67.2	50.8	–	–	67.2	50.8
	SD=	13.1	30.5			13.1	30.5
	range=	47–79	29–72			47–79	29–72
	N =	6	2			6	2
Education (years)	mean=	16.1	16.4	14.8	16.5	15.8	16.5
	SD=	2.3	2.2	2.5	2.5	2.4	2.3
	N =	41	41	14	26	55	67
Socioeconomic Status (SES)	mean=	25.3	25	34.7	22.2	27.6	24.0
	SD=	11.1	9.7	14.4	10.4	12.5	9.9
	N =	41	41	13	23	54	64
Handedness	mean=	20.7	21.5	23.6	19.2	21.6	20.5
	SD=	6.9	9.3	13.3	10.6	9.1	9.8
	N =	35	33	14	24	49	57
Body Mass Index (BMI)	mean=	26.0	24	26.8	23.8	26.2	23.9
	SD=	3.7	7.5	4.8	5.1	3.9	6.7
	N =	40	41	11	22	51	63
Estimated IQ	mean=	114.5	117	108.3	113.3	112.4	115.0
	SD=	9.5	6.8	4.6	7.1	8.6	7.1
	N =	26	23	13	26	39	49
Dementia Rating Scale (DRS) Total	mean =	139.8	141.0	139.8	141.8	139.8	141.4
	SD=	2.6	2.1	1.6	1.9	2.3	2
	N =	32	24	13	21	45	45
Lifetime alcohol consumption (kg)	mean=	54.9	15.3	111.3	141.8	67.9	14.8
	SD=	92.0	14.9	146.4	1.9	107.5	15.7
	N =	30	23	9	21	39	30
Smoker	yes/no	14/27	11/29	9/5	2/24	19/36	14/53

SD=standard deviation; N=immber of subjects

SES: Low scores reflect higher SES

Handedness: right handedness=14–32; left handedness=50–70 (Crovitz and Zener, 1962)

Estimated IQ: mean of NART-IQ and ANART-IQ where available Peabody Picture Vocabulary Test for adolescents