| Objective:Using with parents, teachers and students self-evaluation version of the strengths and difficulties questionnaire (SDQ) by survey teachers and the students'mother and themselves to investigate young people's mental health in Liaoning Province, age 11-17 in school, analysis of the psychological problems of urban and rural youth detection rates, and to assess the different effect of informant and combination of informants on detection rate of psychological problems of students.Methods:1. The study:Comprehensive regard to geographical, economic and other representation of the main factors to select the three cities in Liaoning Province (Shenyang, Benxi, Dandong) Three counties (Qing Yuan, Zhangwu, East Hong Kong) 11-17 year-old schoolchildren in the school. Multi-stage (multiple-stage) stratified, probability sample size ratio (Probability proportion to size, PPS), finally we got a sample of 4986 valid subjects, age in 11 to 17 years.in which there are 2556 boys and 2423 girls,48.74 percent and 51.26 percent of the surveyed sample, respectively. of which there are also 2422 urban students and 2564 rural students,48.74 percent and 51.26 percent of the total students. the average age of the sample is 13.49. this samples were collected both rural and urban, gender, age distribution equilibrium.2. Research tools and methodologies:(1) The use of the difficulties and strengths of the questionnaire (Strength and difficulty questionnaire, SDQ) in three versions over the students, parents and teachers complete the SDQ questionnaire,according to integrated information to determine mood, behavior, hyperactivity and attention deficit three major mental disorders. (2) Analysis method:the use of Epidata the software twice and check the data entry, using spss11.0 packages for further data analysis, computing the total information socres of three informants for students in SDQ and the impact of various factors and factors on the ratings mean, quantile distribution of the information on the three informants in the various factors on the score results and do t-test, while the information on the three informants in SDQ total score and the impact of various factors and correlation analysis between factors in order to examine the various factors in the tripartite information on the rating results; additional information to calculate one of three, any combination of the two informants of information were detected and the tripartite combination of information on human factors and the SDQ total score and the impact of various factors on the detection rate results while calculating the tripartite information in SDQ various factors and total score and impact factor on the McNemar coefficients, and the Kappa coefficient score consistency coefficient, evaluate the consistency of the scores of three informants.Results:Sampling both rural and urban, gender, age distribution of balanced sampling overall passing rate for 84.20%. Comprehensive information on three different people's questionnaire results, after data analysis, using t test and correlation analysis, the result of urban and rural youth, Liaoning Province incidence of psychological problems, emotional problems,7.40%:behavior problems was 7.80%; and hyperactivity problems 8.1%; peer issues 5.30%; the overall difficulty score of 13.60%.To make further analysises of the distribution characteristics, we found that school children from urban had a higher detection rate (17.70%) of psychological problems than students from rural (16.60%),. Moreover, male students experienced a higher detection rate (21.10%) of psychological problems than female students (14.20%)In the emotional, behavioral, peer, prosocial conducts four dimensions, teachers, parents and pupils of information between the evaluation scores, on average, between the existences of significant differences. In the emotional, pro-social dimension, teachers, parents and students score average, followed by an increase; in behavior dimension, parents, teachers and students score average, followed by an increase; in companion dimension, teachers, parents and average scores of students, followed by reduced; in the total score and impact factor scores, teachers and parents ratings there is no significant difference between the teachers and students, parents and students score among the significant difference on the whole, teachers and parents, the mean score should be significantly lower than the mean score of students. In the hyperactivity dimension, teachers, parents and students score between, no there are significant differences.Information in three dimensions on a 7 rating, in addition to total score on the parents and the correlation between the number of students score 0.44; in impact factor scores, parents and students, the association between score of 0.30; emotional factors on the parents and the Students score correlation of 0.40; hyperactivity factor on the association between teachers and parents rating of 0.32; the pro-social behavior, the parents, and students score between the correlation of 0.32, the three dimensions of information in ratings among the seven the correlation coefficient over the range between 0.10 and 0.29, between the existence of only a weak correlation. the Kappa value of three dimensions of information in ratings over the range between 0.01 and 0.19, the Consistency is very low.The results of three informants show that the detection ratio of emotion,behavior hyperactivity problems,peer issues and any problems for students is 8.60%,8.80%,9.40%,6.00%,5.90% and 16.70%, respectively. the detection ratio of signal informant of emotion,behavior,hyperactivity problems,peer issues any problems for students are that the student higher than parents, then the parents higher than teachers. the detection ratio of full mental disorder is 59.3%(9.9%/16.7%),30.5% (5.1%/16.7%)and 31.1%(5.2%/16.7%)respectively; the results of the any combination of the two informants show that, excluding emotion problems and overall difficulty, the detection ratio level of emotion problems,behavior problem,hyperactivity problems,peer issues,prosocial behavior, all highter than the detection ratio of signal informant, are 58.1%-85.6%,54.7%-84.9%,51.1%-84.1%,54.3%-85.1%,60.0%-81.7%,66.3%-70.7% respectively.Conclusion:This study showed that in Liaoning Province the detection rate of psychological problems of adolescents:is 16.7%. the detection ratio of single informant and combination of any two informants, compared to the detection ratio of three informants, the missing detection ratio are 40-70% and 15-40%. So the result of this study, show that when SDQ are used to detect the mental problems, students,the parents of student and the teachers of the students should be investigated.
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