Table 1.
Structure of MedDRA: five hierarchical levels of MedDRA, number of terms per level and some examples of the 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 |