ABSTRACT
Objective@#To understand neglect and its associated factors among migrant middle school students in Tianjin, and to help them develop physically and mentally.@*Methods@#A survey of 3 666 middle school students in 10 middle schools located in migrant gathering regions was conducted. Neglect and associated factors were collected and compared between migrant and non-migrant students.@*Results@#The neglect rate of migrant middle school students in Tianjin was 45.79% and that of non-migrant students was 31.37%, the difference was statistically significant (χ2=56.25, P<0.01). The total neglect of middle school students who moved with them was (52.46±8.12) points; the neglect of boys, junior high schools, non-only children, fathers and mothers with high school education and below were significantly higher than those of girls, high schools, single children, and parents with high school education (t=3.73, 10.40, -11.36, 13.81, 15.57, P<0.01). The longer the follow-up period and the lower the family income, the higher the degree of neglect among the middle school students, and the difference was statistically significant (F=89.27, 53.48, P<0.01). Regression analysis showed that the following time (OR=3.55), whether the only child (OR=4.19) showed a positive correlation with the neglect of middle school students; family income (OR=0.71), parental education (OR=0.48, 0.25) were negatively correleted with neglect (P<0.05).@*Conclusion@#The neglect of middle school students in Tianjin is serious. The time of family migration, family income and parental education are important factors affecting neglect.
ABSTRACT
<p><b>OBJECTIVE</b>To detect genetic diversity of 48 population of Polygonum capitatum in Guizhou province.</p><p><b>METHOD</b>The genetic diversity of 48 representational populations of P. capitatum including 240 individuals had been investigated by ISSR marker technique.</p><p><b>RESULT</b>The genetic diversity had been revealed as follow: A total of 8 293 bands were produced in 240 individuals, of which 7 962 bands were common in the 48 population. The value of the average percentage of polymorphic bands (PPB) was 79.09%, Nei's genetic diversity index (H(e)) was 0.245 8, Shannon's information index (I) was 0.396 2, and genetic differentiation index (G(st)) was 0.238 0 at population level, respectively. The genetic differentiation index (G(st)) was 0.072 2, genetic differentiation coefficient by Shannon's diversity (I(st)) was 0.044 2 within the population levels. Groups cluster analysis based on the UPGMA method indicated that although the 48 populations could be divided into 3 groups and the P. capitatum seed sources. The groups cluster showed that a cross clustering of P. capitatum between the southwest and southeast populations in Guizhou province, and no significant correlation was found between geographical and genetic distance among them.</p><p><b>CONCLUSION</b>The genetic diversity of P. capitatum is relatively high at the population levels, while low within the population levels, a significant degree of genetic differentiation occurs among the populations. The groups cluster analysis indicated they has not apparent genetic variation in regional pattern between the place of origin populations and the migrate populations.</p>