Table 1.

Demographic and clinical characteristics of the study sample

Characteristic	Group; mean ± SD or %		p value
	Primary (n = 2769)	Revision (n = 534)
Age, yr	44.0 ± 9.1	48 ± 10	< 0.001
Female sex	83	90	< 0.001
Initial BMI	49.9 ± 8.6	42.7 ± 10.8	< 0.001
Comorbidity
Diabetes	30	19	< 0.001
Hypertension	41.3	27.4	< 0.001
Dyslipidemia	26.9	13	< 0.001
Reflux	24	42.1	< 0.001

BMI = body mass index; SD = standard deviation.