Figure 8: HCT value preoperatively and after 1 year. The mean HCT level in the first month follow-up was 23.85 ± 5.2 (t-test = 6.954), which was a significant increase after the operation. After 3 months the mean HCT level was 26.56 ± 4.56, which was another significant increase from the previous follow-up visit. After 6 months the mean value was 25.10 ± 4.66, with a slight decrease from the previous visit but still significantly more than the preoperative value. After 9 months the mean value became 29.00 ± 7.33, which was the highest value during the first year and with a significant increase as well. After 12 months the mean value was 26.99 ± 6.86, with a slight decrease from the previous visit but still with a significant increase from the preoperative value. HCT, hematocrit.