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Boxplot with violin element comparison of final grade between 64 h (n = 49), 60 h (n = 45), 56 h (n = 33), 52 h (n = 6), and 48 h (n = 8) of class hours attendance. *Final grade higher than 48. αFinal grade lower than 64 and higher than 48. #Final grade lower than 64
