For the upper secondary level, most countries' enrollment rates fell close to 90 percent, with a few exceptions. The United Kingdom's enrollment was 84.2 percent, while Spain's was 81.6 percent. Turkey was the extreme outlier, with an enrollment rate of 33.9 percent. Enrollment rates varied among countries partially due to differing definitions of postsecondary education and what age it begins. For the 22 to 25 age group, Norway's enrollment is highest at 18.9 percent, Denmark follows at 18.3 percent, and the United States is third at 16.7 percent.
Turkey continues to rank last with enrollment just under five percent.
In 1992-93 there were 439,000 foreign students studying at U.S. colleges and universities. This was 19,000 more than the year before, or a 5 percent increase. Only Canada, Switzerland, and Brazil join the United States in having state or provincial control of education. Eleven of the 20 countries have ethnically homogeneous populations. For the countries participating in the assessment, the average length of the school year ranged from approximately 172 days in Portugal to approximately 251 days in China.