Table 2.

Multivariable model : association between overnight change in calf circumference and log(REI+1). To account for the non-linear effects, a linear spline regression with one knot located at zero was fitted for overnight change in calf circumference, which segregates the change in calf circumference into the negative and positive components. Within each partition, a linear association between the overnight change in calf circumference and log(REI+1) is reported.

Male (n=106)
term	estimate	SE	statistic	p value
(Intercept)	−1.90	0.94	−2.00	0.05
Age	0.03	0.01	3.90	0.0002
Mexican American: non-Hispanic white	0.29	0.16	1.70	0.09
Nighttime calf circumference	0.08	0.02	4.30	<0.0001
Overnight increase in calf circumference (negative part)	−0.20	0.11	−1.80	0.08
Overnight increase in calf circumference (positive part)	0.60	0.38	1.60	0.12
Overnight increase in total body water	0.03	0.01	2.80	0.01
Female (n=84)
Term	estimate	SE	statistic	p value
(Intercept)	1.00	1.00	1.00	0.32
Age	0.01	0.01	1.49	0.14
Mexican American: non-Hispanic white	0.28	0.18	1.58	0.12
Nighttime calf circumference	0.03	0.02	1.30	0.20
Overnight increase in calf circumference (negative part)	0.10	0.14	0.75	0.46
Overnight increase in calf circumference (positive part)	0.30	0.34	0.87	0.39
Overnight increase in total body water	−0.02	0.01	−1.61	0.11