HFE and type 2 diabetes mellitus: Re-analysis of data for 30-day complications in open versus laparoscopic RYGB procedures after stratifying for gender, the presence of type 2 diabetes and hypertension (data not shown), revealed a statistically higher percentage of females with abnormal serum iron levels (3% vs. <1%, p < 0.049) and a higher percentage of females who were homozygous for the HFE H63D allele (8% vs. 2%, p < 0.032) for those with any complication.