Figure 9: HB value preoperatively and after 1 year. The mean HB level in the first month follow-up was 8.49 ± 1.52 (t-test = 9.179), which was a significant increase from the preoperative level. After 3 months the mean HB level was 8.76 ± 1.49, which was another significant increase from the previous follow-up visit. After 6 months the mean value was 8.04 ± 1.59, with a slight decrease from the previous visit but still significantly higher than the preoperative value. After 9 months the mean value became 9.88 ± 1.93, which was the highest value during the first year and with a significant increase as well. After 12 months the mean value was 9.31 ± 1.79, which was a slight decrease from the previous visit but still significantly higher than the preoperative value. HB, hemoglobin.