Table 4.

Stepwise regression analyses of muscle sympathetic nerve activity (MSNA) in men (n = 72).

Model	Predictor variables	Standardized coefficients	Standard error	R2	P
MSNA burst frequency (bursts/min)
1	Step 1 Neck circumference (cm)	0.348	0.38	0.12	0.003
2	Step 1 Neck circumference (cm)	0.295	0.38	0.12	0.01
	Step 2 Log ALT (U/L)	0.249	6.13	0.18	0.03
3	Step 1 Neck circumference (cm)	0.295	0.38	0.12	0.01
	Step 2 Log ALT (U/L)	0.249	6.13	0.18	0.03
4	Step 1 Neck circumference (cm)	0.312	0.39	0.14	0.006
	Step 2 Insulin AUC0−120 (mU min L−1)	0.279	0.00	0.22	0.02
MSNA burst incidence (bursts/100 hb)
1	Step 1 Neck circumference (cm)	0.262	0.57	0.07	0.03
2	Step 1 Neck circumference (cm)	0.262	0.57	0.07	0.03
3	Step 1 Neck circumference (cm)	0.262	0.57	0.07	0.03
4	Step 1 Neck circumference (cm)	0.262	0.57	0.07	0.03

Model 1. Variables entered: neck circumference (cm), age (years).

Model 2. Variables entered: Model 1 and adiposity indices- BMI (kg/m²), waist circumference (cm), log leptin (ng/ml), log ALT (U/L).

Model 3. Variables entered: Model 2 and lipid and blood pressure indices- LDL-C (mmol/L), log HDL-C (mmol/L), log triglycerides (mmol/L), NEFA (mEq/L), systolic blood pressure.

Model 4. Variables entered: Model 3 and indices of hyperinsulinemia and insulin resistance- log Matsuda ISI, insulin AUC₀₋₁₂₀ (mU min L⁻¹).