Table 1.

Participant Characteristics

High School or LessMore than High SchoolMCI
Continuous VariablesMeanSDMeanSDd95% CIMeanSD
Age71.546.2472.186.330.17(−0.07, 0.28)73.057.27
Medication count8.074.917.274.510.16(−0.01, 0.36)7.904.55
Adjusted GDS1.091.880.871.480.14(−0.04, 0.32)1.622.04
Discrete Variablesn%n%V95% CIn%
Female920.666780.570.05(0.00, 0.11)5340.43
White1050.7610430.8790.14(0.09, 0.20)11440.92
Elevated brain Aβ240.172450.210.00(0.00, 0.08)6260.50
History of HTN780.564870.410.09(0.04, 0.15)6360.51
Has SMC170.121830.150.00(0.00, 0.08)5540.45
In ADNI480.354370.370.00(0.00, 0.07)5680.46
  • Abbreviations: ADNI, Alzheimer's Disease Neuroimaging Initiative; GDS, Geriatric Depression Scale; HTN, hypertension; MoCA, Montreal Cognitive Assessment; SMC, Subjective Memory Complaint; SD, standard deviation; SE, standard error; CI, confidence interval; V, Cramer’s V – measure of association between two nominal variables; d, Cohen’s d -- an effect size used to indicate the standardised difference between two means; MCI, mild cognitive impairment.

  • Notes: Continuous variables compared between education groups using t test with Cohen's d for effect size. Discrete variables compared between education groups using chi-square tests with Cramer's V, with bias correction, for effect size. 95% CIs are for effect size. Bolded effect size values are significant at P < .05 level.