Alcohol
Alcohol Units Per Week
The consume_latest_units_per_week is a calculated units value derived from the text of consume_latest_units. The text is parsed in the following manner:
Find units for value (units)
if consume_latest_units contains "pint" - units = value * 2.3 (assuming 1 pint of 4% ABV)
if consume_latest_units contains "glass" - units = value * 2.3 (assuming 175ml glass of 13% ABV)
if consume_latest_units contains "bottle" - units = value * 10
otherwise - units = 1
Find multiplier for value (multiplier)
if consume_latest_code = SN 105542008 (Teetotaller) - multiplier = 0
if consume_latest_code = SN 1082641000000106 (Alcohol units per week) - multiplier = 1
if consume_latest_code = SN 266917007 (Trivial drinker - \<1u/day) - multiplier = 1
(Units are sometimes given as \"/day\" but with a value > 7. All instances assumed to be for week.)
if consume_latest_code = SN 442547005 (Alcohol units consumed on heaviest drinking day) - multiplier = 1.5
(This code provides no clear indication for weekly consumption. Estimated as half again per week.)
if consume_latest_code = contains no indication of time period - multiplier = 1
(Assuming value is for a week)
if consume_latest_units contains \'day\' or variation - multiplier = 7
if consume_latest_units contains \'week\' or variation - multiplier = 1
if consume_latest_units contains \'fortnight\' or variation - multiplier = 1/2
if consume_latest_units contains \'3 weeks\' or variation - multiplier = 1/3
if consume_latest_units contains \'month\' or variation - multiplier = 1/4
if consume_latest_units contains \'2 months\' or variation - multiplier =1/8
if consume_latest_units contains \'3 months or variation - multiplier = 1/13
if consume_latest_units contains \'4 months\' or variation - multiplier = 1/17
if consume_latest_units contains \'6 months\' or variation - multiplier = 1/26
if consume_latest_units contains \'year\' or variation - multiplier = 1/52
if consume_latest_units contains \'Never\' or variation - multiplier = 0
Creating a calculation:
latest_units_pw = latest_value * units * multiplier
OR
if consume_latest_units contains "occasionally" or a variation - latest_units_pw = 0.55
(Estimating consumption, whatever value, will be below 1 unit per week)
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