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Table 8 Four high-frequent topics in the research of particulate matter and atherosclerosis
| Topics | Cluster | Explained variation, % |
|---|---|---|
| Topic 1. Epidemiological studies on the associations between tobacco exposure and atherosclerosis | Clusters 1, 3, and 9 | 3.5, 10.67, 4.44 |
| Topic 2. Epidemiological studies on the associations between environmental particulate matter exposure and atherosclerosis | Clusters 2 and 4 | 24.44, 1.33 |
| Topic 3. studies on the different roles of particulate matter size/components/source in health effects | Clusters 6 and 10 | 35.11, 7.11 |
| Topic 4. Toxicological studies on particulate matter-induced arteriosclerosis | Clusters 5, 7, and 8 | 6.67, 2.67, 3.11 |
