A list of 152 16x16 asymmetrical contact matrices, one for each country, describing which age groups have contact with which other age groups AT SCHOOL. The units of entries are the average number of contacts with a person in that age group in a day. The columns are the age groups 0-5 (X1), 5-10 (X2), 10-15 (X3), and continuing with 5 year gaps up to 80 years old. The rows are the age group of the contact, where row 1 is 0-5 year olds, row 2 is 5-10 year olds, etc. up to 80 year olds.