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Table 3 Purchases and drug use periods by ATC class among persons with Alzheimer’s disease in the MEDALZ-2005 data during years 2002-2009

From: From prescription drug purchases to drug use periods – a second generation method (PRE2DUP)

ATC CLASS

Purchases

Drug use periods

N

N

Number of purchases per drug use period

DDD of drug use period

Length in days

DDD per day

  

Median

Mean

Median

Sum

Median

Mean

Median

Mean

A

402,210

82,735

2

5

100

3,2475,207

150

418

0.85

1.00

B

116,233

19,422

3

6

200

7848,540

351

638

0.64

0.87

C

1,075,095

124,811

5

9

300

8,6698,771

573

864

0.60

0.78

G

130,913

21,662

3

6

133

8886,697

241

529

0.78

0.78

H

86,325

14,297

3

6

133

5062,266

253

615

0.60

0.76

J

155,495

94,577

1

2

8

2040,569

21

106

0.33

0.38

L

17,547

2,061

6

9

335

1308,533

566

778

0.80

0.81

M

202,855

70,855

1

3

33

1,0474,142

50

197

0.75

0.77

N

1,328,357

173,702

4

8

140

8,3409,222

320

596

0.68

0.75

P

3,445

1,366

1

3

6

95,713

15

217

0.40

0.42

R

117,953

29,594

1

4

64

7443,245

138

349

0.67

0.74

OTHER

156,657

68,757

1

2

0

5085,132

28

147

0.00

0.11

TOTAL

3,793,085

703,839

   

250,828,037

    
  1. PRE2DUP created 703,839 drug use periods from 3,793,085 purchases. The total number of purchased DDDs was 250,828,037. OTHER included ATC classes D, S and V. The common names of ATC classes are found in Table 1.