Table 1.

Coefficient (B) in testing model of mediation effect.

Year	Xa–Yb(path cc)	X–Md(path ae)	(X+M)–Y
			X(path c'f)	M(path bg)
2011	0.018h	–0.023h	0.017h	–0.005
2015	0.012h	0.011i	0.012h	0.022h
2018	0.013h	0.022h	0.010h	0.139h

^aX: midday napping time.

^bY: hypertension.

^cpath c: regression between X and Y.

^dM: BMI.

^epath a: regression between X and M.

^fpath c: regression between X and Y with M controlled.

^gpath b: regression between M and Y with X controlled.

^hP<.001.

ⁱP<.01.