Objective To evaluate the effect of a health education for preventing HIV/AIDS in floating population. Methods A computerized literature search was carried out in PubMed, CBM (Chinese Biomedical Database), CNKI (Chinese National Knowledge Infrastructure), Wanfang (Chinese) and VIP (Chinese) databases to collect articles published between 1996 and 2006 concerning the effect of a HIV/AIDS education intervention in floating population. We also checked the reference lists of relevant articles. The study type was self-control intervention study. Meta-analyses were performed to assess 3 outcomes of the intervention, i.e. knowledge about HIV transmission, means of prevention and attitudes towards HIV/AIDS patients. Fixed and random effect models were employed to combine results after a heterogeneity test, with rate difference (RD) used as the indicator of intervention effect. Results The analysis showed that the RD for knowing the sexual transmission route of HIV, the RD for knowing the effect of condoms for HIV prevention, and the RD for changing attitudes towards HIV/AIDS patients, i.e. treating them as ordinary people, were increased by 16% (0.10, 0.22), 22% (0.17, 0.28) and 19% (0.13, 0.25), respectively. Conclusion Health education for preventing HIV/AIDS is effective in changing knowledge and attitudes in floating population.
Objectives To systematically review the relationship between indoor decoration and childhood leukemia in China. Methods CNKI, WanFang Data, VIP, CBM, PubMed, EMbase and The Cochrane Library databases were electronically searched to obtain case-control studies of the relationships between indoor decoration and childhood leukemia from inception to December 2016. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies. Then, meta-analysis was performed by using RevMan 5.3 software. Results A total of 13 studies involving 1 727 cases and 2 468 controls were included. The results of meta-analysis showed that indoor decoration could increase the risk of childhood leukemia in China (OR=2.69, 95%CI 1.82 to 3.98, P<0.000 01). Conclusions The current evidence suggests that indoor decoration is a risk factor for childhood leukemia in Chinese. Due to limited quality and quantity of the included studies, more high-quality studies are required to verify above conclusions.
The current issue of air pollution has pushed the development of the corresponding observational air pollution studies. The World Health Organization has developed a new risk of bias (RoB) assessment instrument and a related guideline for assessing the risk of potential bias in observational air pollution studies. This study introduced the background, methods, uses, advantages and disadvantages, precautions, and usage scenarios of the RoB instrument. It is expected to provide researchers with corresponding quality evaluation tools when writing related systematic review and meta-analysis, which will also help provide reporting standards for observational air pollution studies, thereby improving the quality of studies.