"The modest percentage of female aviators across the industry can largely be attributed to the low rate of women at the Civil Aviation College," the working group noted in reference to the fact that the school produces 40 percent of all pilots in Japan. Of the 108 students who joined the college last year, only six were women. The working group took special note of the school's 158-cm height limit as a reason. Not only must applicants be at least 158 cm tall, they also have to pass tough tests in the advanced Mathematics III category, high-school-level physics and other science subjects. The committee concluded that the enrollment requirements discourage women from studying at the Civil Aviation College, as private universities with pilot educational courses and airlines do not impose such prerequisites.