Table 2 An example of purchase history, consisting of five purchases; each of 10 DDDs and average dose is one DDD per day
From: From prescription drug purchases to drug use periods – a second generation method (PRE2DUP)
Purchase i | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
DDD | 10 | 10 | 10 | 10 | 10 |
Days between i and i + 1 | 10 | 5 | 15 | 10 | NA |
DDD per day to next purchase | 1,00 | 2,00 | 0,67 | 1,00 | NA |
Sliding temporal average DDDAVGi | 1,09 | 1,33 | 0,80 | 0,92 | 1,00 |
Calculated refill time length in days | 9,17 | 7,50 | 12,50 | 10,83 | 10,00 |