births. The first interview (MM1) was completed largely by phone in 1993 to 1996 and obtained a 72% response rate. This was followed by a second wave of interviews (MM2), conducted in 1994 to 1998, with a response rate of 83%. Data on AC and AD were collected at both of these waves. We used the measures of drink frequency, regular quantity, maximum quantity, and AD from MM1 because of the larger sample size, but drunk frequency was only assessed at MM2 and so those data were used.
