The positive result of prick test with cotton dust 12 Table 3.2.The results of Prick test in AR caused by cotton dust Group Results Intervention group Control group p Total n% n% CN% Grade 1 15 17, 4 16 18, 6 p>0, 05 31 18, 0 Grade 2 30 34, 9 30 34, 9 p>0, 05 60 34, 9 Grade 3 30 34, 9 30 34, 9 p>0, 05 60 34, 9 Grade 4 11 12, 8 10 11, 6 p>0, 05 21 12, 2 Total 86 86 172 100% Interpret: Both Grade 2 and Grade 3 had the highest rates (34, 9%).