Units alcohol per occasion
And on the days when you did drink alcohol, on average how many units did you drink in a day?
if ff_ivlolw = 1 | ff_everint = 1 (interviewed at prior wave or has been interviewed previously)
and if HHGRID.SEX = 2 & ((HHGRID.DVAGE > 15 & HHGRID.DVAGE < 50)| (GRIDVARIABLES.NewMum = 1) (Female and aged 16 to 49 or is a new mother)
and if (Preg = 1|2) | MorPreg = 1 (Was pregnant at last interview or has been pregnant since last interview or next pregnancy)
and if PregOut < 3 (If pregnancy resulted in a live birth)
and if AEDROF = 5 | 6 (If drank alcohol once or twice a month or less than once a month)