Table 4.

Multivariable model (n=188): association between overnight change in neck 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 neck circumference, which segregates the calf circumference into the negative and positive parts. Within each partition, a linear association between the overnight change in neck circumference and log(REI+1) is reported.

Term	estimate	SE	statistic	p value
(Intercept)	−1.70	0.68	−2.49	0.01
Age	0.02	0.00	4.17	<0.0001
Mexican American: non-Hispanic white	0.10	0.12	0.90	0.37
Women:men	0.15	0.13	1.17	0.24
Nighttime neck circumference	0.08	0.01	6.30	<0.0001
Overnight increase in neck circumference	0.03	0.03	1.01	0.31
Overnight increase in total body water	0.01	0.01	1.48	0.14