Table 3 The rates of elevated elemental lead(Pb) and cadmium(Cd) in different groups (n(%))
|  | N | Pb>150 (µg/L) | Pb>100 (µg/L) | Pb>50 (µg/L) | Cd>5 (µg/L) | Cd>2.5 (µg/L) |
|---|---|---|---|---|---|---|
Gender | ||||||
 Boys | 16142 | 41(0.25) | 81(0.50) | 1570(9.73) | 0(0.00) | 307(1.90) |
 Girls | 9778 | 21(0.21) | 46(0.47) | 865(8.85)* | 1(0.01) | 171(1.75) |
Age (years) | ||||||
 A[0~1) | 5745 | 14(0.24)# | 25(0.44)# | 435(7.57)# | 0(0.00) | 89(1.55) |
 B[1~3) | 8049 | 32(0.40)# | 69(0.86)# | 854(10.61)# | 0(0.00) | 136(1.69) |
 C[3~7) | 6811 | 10(0.15)# | 21(0.31)# | 700(10.28)# | 0(0.00) | 144(2.11) |
 D[7~13) | 4998 | 6(0.12)# | 12(0.24)# | 424(8.48)# | 1(0.02) | 101(2.02) |
 E[13~18] | 317 | 0(0.00)# | 0(0.00)# | 22(6.94)# | 0(0.00) | 8(2.52) |
Year | ||||||
 A(2017) | 5843 | 19(0.33)& | 42(0.72)& | 327(5.60)& | 0(0.00) | 57(0.98)& |
 B(2018) | 5099 | 20(0.39)& | 36(0.71)& | 434(8.51)& | 0(0.00) | 129(2.53)& |
 C(2019) | 4421 | 4(0.09)& | 19(0.43)& | 291(6.58)& | 0(0.00) | 70(1.58)& |
 D(2020) | 3659 | 3(0.08)& | 9(0.25)& | 179(4.89)& | 1(0.03) | 36(0.98)& |
 E(2021) | 3765 | 9(0.24)& | 12(0.32)& | 635(16.87)& | 0(0.00) | 61(1.62)& |
 F(2022) | 3133 | 7(0.22)& | 9(0.29)& | 569(18.16)& | 0(0.00) | 125(3.99)& |
Total | 25920 | 62(0.24) | 127(0.49) | 2435(9.39) | 1(0.00) | 478(1.84) |