Table 3. Paired t-test of the BMI and the complete blood count (CBC) before and after bariatric surgery (n=520).

§ P-value has been calculated using Paired sample t-test.

** Significant at p<0.05 level; MCV: Mean corpuscular volume

Variables	Before Mean ± SD	After Mean ± SD	P-value §
BMI	44.6 ± 6.24	26.7 ± 5.81	<0.001 **
Hemoglobin	13.3 ± 1.73	13.5 ± 2.77	0.140
Hematocrit	41.5 ± 18.8	40.9 ± 6.91	0.514
MCV	82.4 ± 7.34	85.8 ± 7.60	<0.001 **
Vit B12	365.6 ± 223.7	340.1 ± 187.1	0.160