Spending per student from the age of 6 to 15 and science performance
Index of shortage of educational material, school characteristics and science performance
Equity in resource allocation and science performance
Number of students per school, school characteristics and science performance
Expenditure on education and teachers' salaries
Teachers' salaries and science performance
Percentage of fully certified teachers, school characteristics and science performance
Science teachers' participation in professional development activities, school characteristics and science performance
In-house professional development activities
Index of shortage of education staff, school characteristics and science performance
Equity in allocation of material and human resources
Relationship between class size and student-teacher ratio
Relationship between class size and student-teacher ratio, and science performance
Relationship between class size and science performance
Class size and the index of adaptive instruction
Time per week spent learning in regular lessons
Intended learning time in science lessons, school characteristics and science performance
After-school study time
After-school study time, by schools' socio-economic status
Relationship between after-school study time and science performance
Ratio between learning time and PISA scores
Extracurricular activities offered at school
Index of creative extracurricular activities, school characteristics and science performance