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. 2020 Apr 30;14:781–793. doi: 10.2147/PPA.S239196

Table 1.

Attribute and Level Grid

Attributes Level 1 Level 2 Level 3 Level 4 Level 5
1 Storage Refrigerator
(must be stored in the refrigerator)
Refrigerator
(must be stored in the refrigerator)
Refrigerator
(must be stored in the refrigerator)
Room Temp
(store at room temperature)
Room Temp
(store at room temperature)
1b Preparation Mix
(mix the medicine before use)
Ready to Use
(no mixing required)
Mix, Then Room Temp
(mix the medicine before use; once mixed can be stored at room temperature)
Mix
(mix the medicine before use)
Ready to Use
(no mixing required)
2 Injection device Injection Device
(continuous push on the button/plunger while injecting)
Autoinjector
(single push of the button to inject)
Needle Free Device
(pushes medicine through the skin using high pressure)
3 Maintenance Single Use, Disposable Syringe
(throw away after one use)
Multi Use, Disposable Pen
(use for up to 28 days, then throw away)
Multi Use, Disposable Pen
(use for up to 28 days, then throw away)
Multi Use, Reusable Pen
(use for up to 28 days, then replace cartridge)
Multi Use, Reusable Pen
(use for up to 28 days, then replace cartridge)
3b Dose setting Pre-Set Dose
(dose is already pre-set)
Set the Dose
(must set the dose each time)
Dose Memory
(set the dose the first time, then device remembers it)
Set the Dose
(must set the dose each time)
Dose Memory
(set the dose the first time, then device remembers it)
4 Injection schedule Once Daily Once Weekly Once Every 2 Weeks Once a Month