Control Variables


	Dependent variable:

	heart.rate
	Model 1	Model 2	Model 3	Model 4	Model 5
	(1)	(2)	(3)	(4)	(5)

Caffeine	0.087^***		0.009	0.080^***	0.037
	(0.021)		(0.121)	(0.008)	(0.047)

Stress Index		0.460^***	0.414		0.228
		(0.108)	(0.631)		(0.246)

Time Spent at Gym				-1.441^***	-1.440^***
				(0.062)	(0.062)

Intercept	68.953^***	68.251^***	68.267^***	116.461^***	116.022^***
	(5.454)	(5.535)	(5.568)	(2.942)	(2.982)


Observations	100	100	100	100	100
R²	0.153	0.157	0.157	0.872	0.873

Note:	p<0.1; p<0.05; p<0.01

This models has an \(R^2\) of 0.282, so the blue segments account for about 28% of the residuals.