BLLs in children according to gender BLLs (µg / dl) Ban Thi (n=195) Tan Long (n=208) Total (N=403) Boy (n=109) Girl (n=86) Boy (n=123) Girl (n=85) Boy (n=232) Girl (n=171) n (%) n (%) n (%) n (%) n (%) n (%) 5 - <10 14 (12, 84) 24 (27, 9) 57 (46, 34) 43 (50, 59) 71 (30, 6) 67 (39, 18) ≥10 - 45 95 (87, 16) 62 (72, 1) 64 (52, 03) 40 (47, 06) 159 (68, 54) 102 (59, 65) > 45 0 0 2 (1, 63) 2 (2, 35) 2 (0, 86) 2 (1, 17) pKhi2/Fisher 0, 008 0, 702 0, 146 X ± SD 16, 53 ± 5, 95 14, 01 ± 6, 80 13, 84 ± 11, 19 12, 92 ±11, 92 15, 08 ± 9, 19 13, 49 ± 9, 69 pManWhitney 0, 006 0, 368 0, 020 11 Interpret: In the both sites, the mean of BLLs were more likely in boys than in girls, with p < 0.05 Table 3.6-3.7.