Drinker status (composite)
Name alcohol_drinker_composite
Chapter Health Behaviour/Alcohol
Definition
Drinker status of patient from Read codes and number of units per day or

week. Rated as excess drinker if exceeds the Department of Health recommended

levels of 3 units per day (or 21 per week) for men and 2 units per day

(or 14 per week) for women
Data Type Categorical
Data sources GPRD
Repeated Yes
Valid event date range 01/01/1900 - 25/03/2010
Agreed 02.03.2011 (Revision 1)
Category Definition
0 Non drinker
1 Ex-drinker
2 Occasional drinker (less thsn nonce per week)
3 Current drinker
4 Excess drinker
5 Drinker status not specified
Implementation
If Read code in alcohol drinker code list, then alcohol_drinker_comp = relevant category 
IF sex = 0 AND (alcohol_units > 21 per week OR alcohol_units_cat = 4 or 5), THEN alcohol_drinker_comp = 4 
IF sex = 1 AND (alcohol_units > 14 per week OR alcohol_units_cat = 3 or 4 or 5), THEN alcohol_drinker_comp = 4 
IF sex = 0 AND (alcohol_units >= and <= 21 per week OR alcohol_units_cat = 2 or 3), THEN alcohol_drinker_comp = 3 
IF sex = 1 AND (alcohol_units >= 1 and <= 14 per week OR alcohol_units_cat = 2), THEN alcohol_drinker_comp = 3 
IF sex = 0 AND (alcohol_units <1 on single day OR alcohol_units_cat = 1), THEN alcohol_drinker_comp = 2
IF sex = 1 AND (alcohol_units < 1 on single day OR alcohol_units_cat = 1), THEN alcohol_drinker_comp = 2
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