Table 1.

The demographics of the groups

n	BG group	NBG group	p
	45	62
Age, (years), mean (SD)	47.1 (6.9)	46.5 (6.6)	0.98
Women, n (%)	22 (48.9)	31 (50.0)	0.53
1-level/2-level surgery, n (%)	29/16 (64)	40/22 (64)	0.57
BMI, mean	24.7	25.5	0.39
Smokers, n (%)	13 (29)	20 (32)	0.80
Preoperative EQ-5D mean	0.44	0.38	0.36