When the pressure around the chest wall returns to that of the surrounding air, expiration occurs passively owing to the elastic recoil of the lungs and chest wall. However, during the poliomyelitis epidemic mortality decreased from 87% to 40% when INPV was replaced by positive-pressure ventilation.
Part-Time Per-Credit Costs. The per-credit-hour charge for part-time undergraduate students at Wilmington University in 2015 - 2016 was $346. Typically, college classes consist of 3 or 4 credits, bringing the cost per class to $1,038 or $1,384. At many colleges, full-time tuition kicks in at around 12 credit hours.
Qualified online military students and military spouses (as defined by Liberty University) are given a discount on the cost of tuition. For undergraduate programs (Certificate, Associates, and Bachelors), the tuition rate is $250 per credit hour, which is the Tuition Assistance cap for Army, Air Force, Navy, Marines, and Coast Guard. The tuition rate for graduate online military students and military spouses is $275 per credit hour. This tuition rate applies to all graduate programs (Certificate and Masters), as well as Doctor of Education (Ed.D.) and Educational Specialist (Ed.S.) programs.