Table 4.

Association of 2-year change in physiologic measurements and psychological assessments with change in BMI or waist circumference for surgical group subjects

2-Year change variables (N)	BMI partial correlation coefficienta	P value	Waist circumference partial correlation coefficienta	P value
Waist circumference (315)	0.56	<0.0001	—	—
Percent body fat (311)	0.76	<0.0001	0.54	<0.0001
Systolic blood pressure (212)	0.26	0.078	0.14	0.037
Diastolic blood pressure (212)	0.06	0.35	0.10	0.15
Resting heart rate (209)	0.19	0.008	0.15	0.03
Glucose (265)	0.24	0.0001	0.15	0.015
Insulin (265)	0.31	<0.0001	0.25	<0.0001
HOMA-IR (259)	0.34	<0.0001	0.26	<0.0001
HbA1c (183)	0.27	0.0002	0.89	0.23
Total cholesterol (271)	0.29	<0.0001	0.31	<0.0001
LDL-cholesterol, measured (271)	0.31	<0.0001	0.32	<0.0001
HDL-cholesterol (267)	−0.28	<0.0001	−0.30	<0.0001
VLDL-cholesterol measured (267)	0.44	<0.0001	0.44	<0.0001
Triglycerides (271)	0.48	<0.0001	0.45	<0.0001
IWQOL–Lite total score (298)	−0.56	<0.0001	−0.45	<0.0001
SF-36, Physical component score (285)	−0.14	0.019	−0.19	0.0016
SF-36, Mental component score (285)	−0.11	0.08	−0.06	0.30
Apnea/hypopnea index (148)	0.21	0.012	0.13	0.13
% Sleep time SpO2 <90%, sin−1 (%) (148)	0.29	0.0005	0.29	0.0004
Average night-time SpO2 (148)	−0.39	<0.0001	−0.37	<0.0001
Treadmill time, s (157)	−0.35	<0.0001	−0.45	<0.0001
RMR, kcal/day (225)	0.39	<0.0001	0.39	<0.0001

Analysis limited to only those surgical subjects not taking medications at either baseline or follow-up that affect the variable being analyzed.

HDL, high-density lipoprotein; HOMA-IR, homeostasis model assessment of insulin resistance; IWQOL–Lite, impact of weight quality of life–lite; LDL, low-density lipoprotein; RMR, resting metabolic rate; VLDL, very low-density lipoprotein.

^aAdjusted for age, gender, baseline BMI or waist circumference, and baseline levels of the variable analyzed.