Predictive variables for reversal to NGT-24 m were good baseline - cell function ( odds ratio [ OR ] 2.79 [ 95 % CI 2.30-3 .40 ] ) and its further improvement ( OR 5.70 [ 95 % CI 4.58-7 .08 ] ) , and NGT-6 m ( OR 2.10 [ 95 % CI 1.14-3 .83 ] ) .