ABSTRACT
Objective To investigate the risk factors and to provide evidence for prevention and reduction of sports injuries in primary and secondary school students in Guangzhou. Methods 1:1 case-control study was conducted on both 349 cases and controls under the same distribution of sex, age and grade. Conditional univariate and multivariate logistic regression were used to explore the relationships between risk factors and injuries. Results Severe soles wear (OR=7.20, 95% CI: 2.37-21.84),tiredness (OR= 14.34,95%CI:2.29-89.66) or sickness (OR=1.96,95%CI: 1.29-3.06) when participating in sports at a high frequency and history of previous injuries (OR=2.11,95%CI: 1.41-3.96) were risk factors related to sports injury while guidance by teachers and physical education provided by teachers during training (OR=0.46, 95%CI: 0.26-0.79) , appropriate protection (OR= 0.36, 95%CI: 0.20-0.64) as well as warming-up exercise (OR=0.31,95%CI: 0.14-0.67) at a high frequency were protective factors for sports injury. Conclusion Prevention and control on sports injury need to improve the awareness on sports safety for students and teachers in order to develop positive behavior on sports safety.
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the blood lead levels (BLLs) in children after 10-year use of unleaded gasoline in Guangzhou and evaluate the effect of this measure.</p><p><b>METHODS</b>Through stratified random sampling method, 4 kindergartens and 4 elementary schools were selected from each of three districts among 12 districts of Guangzhou. Totally 2373 children were recruited into this survey and 1-2 ml blood was sampled from each child through vein. The lead concentration in blood samples was determined with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) after diluted with 0.1% Triton X-100 and 0.1% HNO(3) in the ratio of 1:20.</p><p><b>RESULTS</b>Among 2373 children, the highest BLL was 330 microg/L, while the lowest was 10 microg/L. Geometric mean (GM) of BLL was 58.28 microg/L with 61.11 microg/L of male and 55.37 microg/L of female (t=8.671, P=0.000). Sixty (2.51%) children were identified as elevated BLLs (>or=100 microg/L), including 36 (2.90%) male and 24 (2.09%) female (chi2=1.594, P=0.207). Compared to the surveys conducted in China 10-year ago, the children with elevated BLLs decreased 96.28% and the GM of BLLs reduced 58.37%. BLLs in suburb children (60.33 microg/L) were higher than those in downtown (58.09 microg/L) or in countryside (56.72 microg/L).</p><p><b>CONCLUSION</b>The BLLs in children and the ratio for children with elevated BLLs, had declined dramatically after 10-year implement of unleaded gasoline in Guangzhou.</p>