Furthermore , the days using mechanical ventilator for the study group ( 38.41 3.35 ) is significantly ( p < 0.001 ) shorter than the control group ( 43.69 14.89 ) , with a decrease of 5.2 days in average , resulting in a saving of healthcare cost of NT$ 45,000 ( US$ 1,500 ) per patient in the current Taiwanese National Health Insurance setting .