1. The number of A&E attendances where the word ‘cocaine’ appears in the free-text diagnosis field.
2. The number of A&E attendances where the word ‘ecstasy’ appears in the free-text diagnosis field.
3. The number of A&E attendances where the word ‘ketamine’ appears in the free-text diagnosis field.
4. The number of A&E attendances diagnosed as F14 under the ICD-10 classification system.
5. The number of A&E attendances diagnosed as F15 under the ICD-10 classification system.
6. The number of A&E attendances diagnosed as F16 under the ICD-10 classification system
