Table 1.

Descriptive Statistics

	All (n = 154)		Cognitively normal (n = 106)		MCI (n = 36)		Dementia (n = 12)
	Mean (SD)	Range	Mean (SD)	Range	Mean (SD)	Range	Mean (SD)	Range
MoCA	24.23 (4.11)	10–30	25.73 (3.08)	11–30	22.06 (3.28)	15–27	17.58 (4.93)	10–25
Age	71.18 (8.26)	46–95	70.40 (8.05)	46–93	72.89 (8.09)	50–87	72.92 (10.17)	63–95
Female	0.64		0.72		0.47		0.42
Education (years)	16.51 (2.65)	7–21	16.58 (2.59)	12–21	16.64 (2.50)	12–20	15.58 (3.50)	7–18
White	0.77		0.75	0.83			0.75
GDS (logged)	0.52 (0.70)	−0.01 to 2.48	0.38 (0.60)	−0.01 to 2.20	0.68 (0.74)	−0.01 to 2.40	1.25 (0.94)	0–2.48
Amygdala atrophy (z)	0.00 (1.00)	−2.40 to 2.76	0.18 (0.88)	−2.00 to 2.76	−0.44 (1.26)	−2.40 to 2.76	−0.37 (1.08)	−1.51 to 1.69
Hippocampus atrophy (z)	0.00 (1.00)	−2.47 to 2.46	0.12 (0.85)	−2.47 to 1.68	−0.53 (1.06)	−1.78 to 2.36	−0.67 (1.20)	−1.37 to 2.46
Intracranial volume (z)	−0.05 (1.01)	−2.72 to 2.98	−0.08 (0.92)	−2.72 to 2.90	0.19 (1.09)	−1.99 to 2.98	0.03 (1.26)	−1.63 to 2.28
Network size	5.12 (2.69)	0–17	5.52 (2.67)	1–17	4.78 (2.54)	1–14	2.67 (1.87)	0–6
Diversity	3.58 (1.52)	0–9	3.83 (1.48)	1–9	3.33 (1.45)	1–7	2.00 (1.10)	0–4
Effective size	2.01 (1.60)	0.00–10.00	2.18 (1.59)	1.00–9.12	1.85 (1.73)	1.00–10.00	1.03 (0.55)	0.00–2.33
Prop. frequent contact	0.72 (0.25)	0.13–1.00	0.68 (0.25)	0.17–1.00	0.77 (0.25)	0.13. 1.00	0.87 (0.19)	0.50–1.00

Note: MoCA = Montreal Cognitive Assessment; MCI = mild cognitive impairment; GDS = 15-item Geriatric Depression Scale.