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Changes in %FVC are demonstrated. After preoperative respiratory muscle training for six weeks, %FVC increased in all patients. All 14 patients underwent surgical correction of scoliosis successfully without any complications. At six weeks after operation, %FVC remained stable or increased slightly. %FVC decreased in all patients at one year, two years after operation and at the last follow-up. The average rate of decline of %FVC was 3.6% per year at the last follow-up
