Objective To provide clinic reference for preventing children from lead poisoning by studying the levels of lead and the conditions of lead poisonings in 29 678 children in Ningbo.
Methods The blood lead levels of 29 678 children visiting to the Ningbo Women & Children's Hospital from January 2011 to June 2014 were detected by using differential potentiometric stripping. The children were divided by gender (boy and girl), age (infant, toddler, preschool child, school-age child, and adolescence), or year of detection (2011, 2012, 2013, and 2014) to analyze the blood lead test results.
Results The average blood lead levels was (32.76& #177;29.07) mg/L of the 29 678 children, and the rate of lead intoxication was 0.56% (166/29 678). The blood lead levels and lead intoxication rates in boys were higher than those in girls (P<0.05). Except the adolescence group, the blood lead levels increased with age (r=0.189, P<0.05), but the lead poisoning rate had no significant differences among different age groups (P>0.05). The blood lead levels decreased over time since 2012 (r=-0.132, P<0.01), and the lead poisoning rate showed an dereasing trend, but no significant differnce.
Conclusion Lead poisonings occur more likely in boys than in girls. The blood lead level is decreased after year of 2012.
DownLoad: