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Table 3 Top 10 semantic types of the environmental factors causing disease, as represented in the Unified Medical Language System (UMLS).

From: The "etiome": identification and clustering of human disease etiological factors

Semantic Type of Environmental Factors Count
Disease or Syndrome 1932
Pharmacologic Substance 1250
Organic Chemical 1076
Therapeutic or Preventive Procedure 521
Neoplastic Process 424
Amino Acid, Peptide, or Protein 310
Biologically Active Substance 274
Hazardous or Poisonous Substance 251
Congenital Abnormality 160
Injury or Poisoning 150