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DER13: Distribution of number of distinct drugs persons take

This query is used to provide summary statistics for the number of number of different distinct drugs (drug_concept_id) of all exposed persons: the mean, the standard deviation, the minimum, the 25th percentile, the median, the 75th percentile, the maximum and the number of missing values. No input is required for this query..

Input:
 Parameter  Example  Mandatory  Notes
drug_type_concept_id Yes

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Sample query run:
The following is a sample run of the query. The input parameters are highlighted in blue

-- Oracle
SELECT min(tt.stat_value) AS min_value
     , max(tt.stat_value) AS max_value
     , avg(tt.stat_value) AS avg_value
     , (round(stdDev(tt.stat_value)) ) AS stdDev_value
     , PERCENTILE_DISC(0.25) WITHIN GROUP( ORDER BY tt.stat_value ) 
                                     AS percentile_25
     , PERCENTILE_DISC(0.5)  WITHIN GROUP (ORDER BY tt.stat_value )
                                     AS median_value
     , PERCENTILE_DISC(0.75) WITHIN GROUP (ORDER BY tt.stat_value )
                                     AS percential_75
  FROM
    ( SELECT count(distinct t.drug_concept_id)  AS stat_value
      FROM drug_era t 
      where nvl(t.drug_concept_id, 0) > 0
      group by t.person_id
    ) tt 
;
 Output:
Output field list:
 Field  Description
drug_concept_id A foreign key that refers to a standard concept identifier in the vocabulary for the drug concept.
percentile_25_date
median_date
percentile_75_date

Sample output record:
 Field  Description
drug_concept_id
percentile_25_date
median_date
percentile_75_date
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