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. 2013 Mar 20;69(7):1453–1466. doi: 10.1007/s00228-013-1482-z

Table 3.

Distributional on NIS reviewed

Distributional data on NIS
Distribution of number of patients, number of healthcare professionals, number of patients per investigator and observational period (days) for each patienta
Mean Median Maximum Range 25th–75th Percentile
Number of patients 2,445.6 600 30,000 29,980 300–1,500
Number of healthcare professionals 364.5 120 3,000 3,000 30–340
Number of patients per healthcare professional 15.4 5 500 499 3–8
Observational period for each patient (in days) 292.4 180 3,650 3,649 59–365
Distribution of the 10 % of the NIS with the highest numbers of recruited patients
Number of patients
X-ray contrast agent 30,000
X-ray contrast agent 25,000
X-Ray contrast agent 20,000
Antidepressant 20,000
Eye drop (ocular hypertension and open-angle glaucoma) 15,000
Antihypertensive agent 15,000
Antihypertensive agent 15,000
Eye drop (ocular hypertension and open-angle glaucoma) 12,800
X-ray contrast agent 12,000
Antibody (oncology therapy) 12,000
Thrombocyte aggregation inhibitor 10,000
Oral antidiabetic drug 10,000
X-ray contrast agent 10,000

aIf defined precisely in the observational plan in advance