Prevalence of allergic rhinitis among study subjects by area (n = 3366) Allergic rhinitis Area Yes No Total p1&2 n% n% n% Urban 383 15, 84 2035 84, 16 2418 71, 84 0, 165 Suburban 132 13, 92 816 86, 08 948 28, 16 Total (n=3366) 515 15, 3 2851 84, 7 3366 100, 0 Comment: The above table showed that prevalence of rhinitis in Ben Thuy school was 14.02%; in Cua Nam school was 15.18%; in Hung Dung, Hung Loc and Nguyen Truong To schools were 15.2; 15.17 and 13% respectively.