The six drug groups considered, together with their ATC-codes and their recommended DDD values (in mg) and whether they are benzodiazepines or z-hypnotics
| Drug group | ATC-code | Type | DDD (mg) |
|---|---|---|---|
| Diazepam | N05BA01 | Benzodiazepine | 10 |
| Oxazepam | N05BA04 | Benzodiazepine | 50 |
| Alprazolam | N05BA12 | Benzodiazepine | 1 |
| Nitrazepam/flunitrazepam | N05CD02/N05CD03 | Benzodiazepines | 5/1 |
| Zopiclone/zolpidem | N05CF01/N05CF02 | z-Hypnotics | 7.5/10 |
| Hydroxyzine/buspirone | N05BB01/N05BE01 | Non-benzodiazepine | 75/30 |
ATC, Anatomical Therapeutic Chemical; DDD, defined daily doses.