Objective To evaluate the association between the concentration of particulate matter (PM2.5)and asthma attack in children.Methods The computer and databases were used to search the key wordsAsthma andChild were searched by means of the subject headings ( Asthma andChild) and free words (Asthma * , Child *andPediatric * etc.),moreover PM2.5 was searched on the basis of free words such asPM2.5, Particulate Matter *which were linked withAND in PubMed and Medline database.Furthermore,the key words asthma AND (Child OR Pediatric OR Infant) AND (PM2.5 OR Particulate Matter OR Inhalable Particles) for keywords were searched in CBM,CNKI,VIP and Wanfang databases.The literatures included those from the initial computer database up to those of December 2014 from computer database.Meanwhile manual research was added to screen literatures according to the standards of inclusion and exclusion.Newcastle-Ottawa Scale was employed to assess the quality of the included literatures including selection,comparability and outcomc.Data wcre synthesized and analyzed by Rcvman5.3 and Stata12.0 version for statistical analysis,heterogeneity test,sensitivity analysis,subgroup analysis,and so on.Results A total of 17 literatures involving 1326573 children were included.The findings from quality assessment involved 2 studies for 8 scores,2 for 7 scores,7 for 6 scores,5 for 5 scores,and 1 for 4 scores,respectively.The result of Meta-analysis showed that the combined the odds ratio (OR) of PM2.5 with childhood asthma attack was 1.06,and 95％ confidence interval(CI) was 1.03-1.08.Subgroup analysis showed that the OR on the asthma hospital visit equaled to 1.03 (95％ CI 1.01-1.06),and the OR on the asthma symptom equaled to 1.11 (95％ CI 1.06-1.16),moreover,subgroup analysis between developed and developing countries showed that the OR of the asthma on developing countries corresponded to 1.04 (95％ CI 1.02-1.06),and the OR of the asthma on developed countries corresponded to 1.06 (95％ CI 1.03-1.09).Conclusion There is a positive correlation between concentration of PM2.5 and asthma attack in children.

Objective:To develop a role model education intervention model for male nursing students, and to explore the effect of role model education on male nursing students′ professional identity and positive psychological capital.Methods:A total of 60 male nursing freshmen were recruited and randomly assigned to the control group (n=30) and the experimental group (n=30) according to a 1:1 ratio. The control group only accepted the school′s routine teaching tasks and other campus activities. The experimental group received 6-week model education intervention on the basis of the control group once a week. Nursing students′ Professional Identity Questionnaire and Positive Psychological Capital Questionnaire were used for assessment at the time of enrollment and after intervention.Results:Male nursing students' professional identity (50.25±11.19) and positive psychological capital (114.68±29.08) were generally not high. After intervention, the scores of occupational self-concept, retention benefits and resignation risks, social persuasiveness and total score in the experimental group were 22.64±5.19,14.29±2.69,8.00±1.89,64.18±12.15, higher than those of the control group (20.07±3.16, 12.93±1.76, 6.86±1.24, 57.68±6.66), and the difference was statistically significant ( t value was 2.23-2.68, P<0.05). Conclusions:Role model education intervention has a good effect in promoting professional identity and positive psychological capital of male nursing students.