Table 1 Structure of MedDRA: five hierarchical levels of MedDRA, number of terms per level and some examples of the terms
From: Exploitation of semantic methods to cluster pharmacovigilance terms
Level | Expanded form | Nb terms | Examples |
|---|---|---|---|
SOC | System Organ Class | 26 | Musculoskeletal and connective tissue disorders |
HLGT | High Level Group Terms | 332 | Joint disorders |
HLT | High Level Terms | 1,688 | Arthropathies NEC |
PT | Prefered Terms | 18,209 | Arthritis |
LLT | Lowest Level Terms | 66,587 | Arthritis, Arthritis aggravated, Atrophic arthritis |
Joint inflammation, Finger arthritis | |||
Total | 86,842 |