group  y1 y2 y3 y4
drug1  72 86 81 77
drug1  78 83 88 82
drug1  71 82 81 75
drug1  72 83 83 69
drug1  66 79 77 66
drug1  74 83 84 77
drug1  62 73 78 70
drug1  69 75 76 70
drug2  85 86 83 80
drug2  82 86 80 84
drug2  71 78 70 75
drug2  83 88 79 81
drug2  86 85 76 76
drug2  85 82 83 80
drug2  79 83 80 81
drug2  83 84 78 81
control 69 73 72 74
control 66 62 67 73
control 84 90 88 87
control 80 81 77 72
control 72 72 69 70
control 65 62 65 61
control 75 69 69 68
control 71 70 65 65