TABLE 3.

Threshold effect analysis of the relationship between physical exercise and score of the Animal Fluency test in the short-sleep elders (based on Model 2).

	β (95% CI)
One-line linear regression model	0.077 (0.051, 0.103)
Two-piecewise linear regression model
Exercise < 9.6 (100*MET-minutes/week)	0.233 (0.154, 0.312)
Exercise ≥ 9.6 (100*MET-minutes/week)	0.013 (−0.027, 0.053)
Log-likelihood ratio test

Age, sex, race, marital status, education, poverty status, body mass index, smokers, alcohol drinkers, diabetes mellitus, and cardiovascular diseases were adjusted.