Variables Class 1 Class 2 Class 3 Class 4 Number of students 32 37 35 41 Number of lessons after recess 2 1 2 1 each week Percentage of male students 50.0% 40.5% 54.3% 43.9% Overall attendance 92.8% 95.4% 80.1% 88.2% Overall class participation Low Low Moderate High Preferred subject Math English Science English Average score in P4 final exams 73.2 69.8 71.9 72.4 Average score in P5 final exams 74.0 67.1 71.3 70.7 Primary task Secondary task Physiological Subjective Possible measures