On multivariable regression , adjusting for preoperative variables , a better TPS was an independent predictor of a shorter interval to first extubation ( P = .019 ) , better transplant-free survival before Norwood discharge ( P < .001 ; odds ratio , 9.1 for inadequate vs optimal ) , shorter hospital length of stay ( P < .001 ) , fewer unplanned reinterventions between Norwood discharge and stage II ( P = .004 ) , and a higher Bayley II psychomotor development index at 14 months ( P = .031 ) .