[Multi-correspondence analysis of the status and related factors of chronic diseases multimorbidity in middle-aged and elderly people in China in 2009].

Objective: To study the status of chronic disease multimorbidity of middle-aged and elderly people over 45 years old in China, and to analyze the influencing factors.
Methods: Using the data of the"China Health and Nutrition Survey(CHNS)", this survey has been carried out in 10 rounds nationwide since 1989. Multi-stage cluster random sampling was used to investigate rural and urban areas in 9 provinces and cities in China. In this study, the general socio-demographic characteristics, disease history, living habits and other information in the 2009 database were used to analyze the subjects who were collected blood samples. The prevalence of 8 common chronic diseases and multimorbidity such as hypertension, mixed-hyperlipidemia and hyperuricemia were described respectively. The Venn diagram in the R software package was used to calculate the multimorbidity of the disease. The χ~2 test and multiple correspondence analysis were used to explore the influencing factors of chronic disease multimorbidity in the middle-aged and elderly people in China.
Results: Among the 5316 subjects, the highest prevalence among 8 chronic diseases was hypertension(2143, 40. 3%). The lowest prevalence was myocardial infarction(87, 1. 4%). There were all together 1498 patients who had two kinds or more than two kinds of chronic diseases with a detection rate of 28. 18%. The most common multimorbidity were hypertension+hyperuricemia(199, 13. 30%), followed by hypertension + mixed-hyperlipidemia(191, 12. 77%). Hypertension+hyperuricemia+mixed-hyperlipidemia was the most common combination of the three chronic diseases(103, 6. 89%). Age(Kendull=0. 158, P<0. 001), region(χ~2=30. 129, P<0. 001), BMI(Kendull=0. 344, P<0. 001) and marital status(χ~2=21. 923, P<0. 001) were associated with the number of multimorbidities. Correspondence analysis showed that subjects aged 65 to 74, living in cities and sleeping less than 7 hours were more likely to have multimorbidity.
Conclusion: The prevalence of chronic disease multimorbidity among middle-aged and elderly residents in China is high. Older age, unmarried, overweight and obesity, too little or too much sleep may increase the risk of multimorbidity.