Objective To epidemiologically analyze the common clinical symptoms of sub-health in Beijing area.Methods By analysis of sub-health,epidemiologlcal data and the method of factors analysis, we studied the features and properties of various symptoms and their relationships that represent various kinds of sub-health.We used the structural equation modeling to validate the relationship between the symptom groups and between the symptom groups and their components.Results The amount of the factors whose weight Values were larger than 1.0 was 13,and the cumulative value of all the factors was 55.67%.With the domain knowledge,however,the total factors were merged into 10.We took fatigue as the main hidden variable to build a structural equation model.The function was x2/df=3.65,and GFI,AGFI,CFI,Tucher Lewis indexes were all above 0.9.The direct effects between the hidden variables showed that fatigue is closely related to fatigue of eyes,sleep,and pain with the weighted coefficient ranging from 0.7 to 1.0. Fatigue is somehow related to the symptoms of stool,pee,fauces,mouth,and sweat with the weighted coefficients about 0.5.The indirect effects between fatigue and hidden vailables showed that fatigue has an effect on moods indirectly with standardized indirect effects and standardized total effects was 0.702 and 0.112.respectively.Conclusions The symptoms of sub-health are complex with a dominating symptom and many other secondary symptoms.The common symptom groups are maladjustment of mood,fatigue, abnormity of sleep,maladjustment of stool and pee,double-minded,fatigue of eyes,and pain.The results of structural equation model shows that the causality between symptoms that are in a symptom group is different,so is the causality between the symptom groups,which shows that the symptoms of the sub-health are of diversity.

Objective To study the outcomes of selective reduction of triplet pregnancy by assisted reproductive technology. Methods The clinical data of 31 women who succeeded in conception by vitro fertilization-embryo transfer in the third affiliated hospital of Guangzhou Medical University were retrospectively investigated to analyze and compare the rates of abortion from triplet pregnancy, twin pregnancy and single pregnancy after selective reduction of triplet pregnancy, the incidence of pregnant complications, outcomes of perinatal period. Results There were no significant differences between triplet pregnancy and the twin and single pregnancy after selective reduction of triplet pregnancy in terms of pregnancy and parity time, fetal disease, premature rupture of membrane, severe eclampsism, gestational diabetes and postpartum hemorrhage (P>0.05). There were significant differences in gestational weeks, birth weight, rate of premature birth, rate of neonatal transfer to NICU and neonatal RDS: The gestational time in the triplet group longer than the groups of twin pregnancy and single pregnancy after selective reduction of triplet pregnancy (P<0.05). (37.3 ± 1.9) vs. (35.2 ± 0.9), (32.6 ± 2.3), respectively), the rate of premature birth dropped (100%vs. 100%, 33.3%, respectively), the body weight was increased (1 707 ± 360.4)g vs. (2 066.1 ± 307.5)g, (2 712.5 ± 514.1)g, respectively and the neonatal complication rate was reduced (P<0.05). Conclusion The selective reduction of multiple pregnancy may decrease the risk of premature birth and reduce the rate of lower body weight of neonates, improving the pregnancy outcomes, but the higher rate of abortion at the early or middle course of pregnancy after selective reduction is worth our attention.