Objective to investigate the characteristics of externalizing problems behavior and related factors in new generation migrant workers so as to provide a decision making basis for consensus propaganda,psychological assistance and intervention.Methods A total of 1 340 new generation migrant workers(male 862,femal 478) were extracted from the gathering areas of mi grant workers in the three cities of Chongqing,Shenzhen and Hangzhou,the questionnaire survey and evaluation were performed by adopting the Youth Self-Report (YSR),Harter Self-Perception Profile(HSPP),Lum Emotional Availability of Parents (LEAP),Perceived Availability of Social Support Questionnaire(PASSQ) and Psychological Acculturation Scale(PAS).Results The tested externalizing problems were slightly higher than the non-clinical tested reasonable scoring range,the peer support had statistical difference between sexes(P＜ 0.01),the personal ability and comprehensive self value had significantly positive correlation (P ＜ 0.01),and both were negatively correlated to the externalizing behavior problems(P＜0.01),parents' emotional availability and support showed significantly negative correlation to externalizing behavior problems(P＜0.01),the working environment support was negatively related to externalizing behavior problems(P＜0.05).The prediction of personal effectiveness to externalizing prob lems behavior was obvious(P＜0.01),the social acceptance(P＜0.01) and overall self value(P＜0.01)were the predictive factors of externalizing problems behavior,and the work environmental support had the predictive effect on externalizing problems behavior (P＜0.05).Conclusion Personal ability,parents' emotional availability and support,work environmental support and social acceptance are correlated with externalizing behavior problems in new generation migrant workers.The overall self value,social accept ance,mother's emotional availability and parents' emotional support have significant prediction,while the work environmental support has a predictive effect on externalizing behavior problems.

OBJECTIVETo determine whether there was excessive risk of cancer among workers exposed to chrysotile fiber alone by applying a meta-analysis technique.

METHODSAll data meeting the criteria of cohort studies on cancer mortality among workers exposed only to chrysotile were incorporated into meta-analysis. Pooled standardized mortality ratios (SMRs) and their corresponding 95% confidence intervals (CIs) for main cancer sites were calculated using two approaches of unweighted ratio and random effect model. The heterogeneity and its sources of the results were examined with a Q-statistic and Z-score test. The dose-response effect as reflected in the percentage of all deaths due to mesothelioma served as a proxy measure of chrysotile exposure.

RESULTSA cohort of twenty six workers exposed to chrysotile alone was summarized. The significantly elevated meta-SMRs for all deaths (1.27), all cancers (1.28), cancers of respiratory organs (2.51), cancers of lung (2.35) and cancers of stomach (1.24) were observed. The significantly elevated meta-SMRs for lung cancer within occupational strata were observed among textile workers (3.55), asbestos product manufacturers (3.30), miners and millers (2.24), cement product workers (1.22), and for stomach cancer among asbestos product manufacturers (1.49). Meta-SMRs for cancers at other sites were not significant. Meta-SMR for lung cancer showed an increasing trend with an elevated percentage of all deaths from mesothelioma, but no such trend for stomach cancer.

CONCLUSIONThere are excessive risks of lung cancer and mesothelioma among workers exposed to chrysotile fiber alone, and likely no convincing indication of an etiological association between chrysotile exposure and cancers at other sites.

Asbestos, Serpentine ; adverse effects ; Cohort Studies ; Dose-Response Relationship, Drug ; Humans ; Lung Neoplasms ; etiology ; mortality ; Mesothelioma ; etiology ; mortality ; Neoplasms ; chemically induced ; mortality ; Occupational Exposure ; Occupational Health ; Risk Assessment ; Stomach Neoplasms ; etiology ; mortality