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OBJECTIVE:To treat patients with vascular mild cognitive impairment (VMCI) using traditional Chinese medicine (TCM),it is necessary to classify the patients into TCM syndrome types and to apply different treatments to different types.In this paper,we investigate how to properly carry out the classification for patients with VMCI aged 50 or above using a novel data-driven method known as latent tree analysis (LTA).METHOD:A cross-sectional survey on VMCI was carried out in several regions in North China between February 2008 and February 2012 which resulted in a data set that involves 803 patients and 93 symptoms.LTA was performed on the data to reveal symptom co-occurrence patts,and the patients were partitioned into clusters in multiple ways based on the patts.The patient clusters were matched up with syndrome types,and population statistics of the clusters are used to quantify the syndrome types and to establish classification rules.RESULTS:Eight syndrome types are identified:Qi deficiency,Qi stagnation,Blood deficiency,Blood stasis,Phlegm-dampness,Fire-heat,Yang deficiency,and Yin deficiency.The prevalence and symptom occurrence characteristics of each syndrome type are determined.Quantitative classification rules are established for determining whether a patient belongs to each of the syndrome types.CONCLUSION:A solution for the TCM syndrome classification problem for patients with VMCI and aged 50 or above is established based on the LTA of unlabeled symptom survey data.The results can be used as a reference in clinic practice to improve the quality of syndrome differentiation and to reduce diagnosis variances across physicians.They can also be used for patient selection in research projects aimed at finding biomarkers for the syndrome types and in randomized control trials aimed at determining the efficacy of TCM treatments of VMCI.