TABLE 4.

Association of cognitive reserve index with working memory stratified by cortisol AM/PM ratio.

CRI estimates for	N	Range	Mean (SD)	OR (95% CI)	p
Low cortisol AM/PM ratio	18	0.44 to 2.78	1.68 (0.75)	2.12 (0.39 to 11.45)	0.382
High cortisol AM/PM ratio	60	2.93 to 42.12	10.06 (7.82)	4.68 (1.32 to 16.60)	0.017

Note: All analyses adjusted for age and sex. Low cortisol AM/PM ratio denotes the unfavorable group representing those with ≤20th percentile (ratio ranges from 0.44 to 2.78) of cortisol AM/PM ratio. High cortisol AM/PM ratio representing those with > 20th percentile (ratio ranges from 2.93 to 42.12) of cortisol AM/PM ratio is the favourable group.

Bold italicized is p value significant at < 0.05.

Abbreviations: CI, confidence interval; cortisol AM/PM ratio, awakening cortisol/bedtime cortisol; CRI, cognitive reserve index; OR, odds ratio.