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Average number of students per Grade 4 class in public primary schools. Average class sizes differ from pupil-teacher ratios because average class sizes reflect the actual number of pupils taught by a teacher at a given time while the pupil-teacher ratio is a more global measure of the teaching resources available in schools. Pupil-teacher ratios are generally lower than average class sizes as teachers typically have additional non-teaching duties. The pupil-teacher ratio is useful for assessing the cost of providing education whereas class sizes are related to the classroom working conditions of teachers. Data available for African countries only. For more information, consult the UNESCO Institute for Statistics' Regional Data Collections page.