„Across OECD countries, 18 % of students skipped at least one class and 15% skipped at least an entire day of school without authorisation in the two weeks before the PISA test. […] In most high-performing school systems, such as Hong Kong-China, Japan, Korea and Shanghai-China, virtually no student skips classes or days of school.“
OECD (Hrsg.), „PISA in Focus 35“ (Jänner 2014), S. 1f