The alcohol purchase age breakdowns

Here is the party breakdown

So in total 30 National MPs voted for 18 and 29 for 20. The same ratio as on marriage equality (but different MPs). Labour had 22 for 18 and 12 for 20.

The other breakdowns are (based on final vote only):

All MPs 68 for 18 – 53 for 20
Electorate MPs 38 – 32
List MPs 30 – 21
Female MPs 23 – 16
Male MPs 45 – 37
Asian MPs 3 – 2
European MPs 52 – 37
Maori MPs 11 – 10
Pacific MPs 2 – 4
20s MPs – 2-0
30s MPs 10 – 3
40s MPs 17 – 21
50s MPs 28 – 20
60s MPs 11 – 8
70s MPs 1-0
Auckland MPs 25 – 17
Christchurch MPs 9 – 4
Provincial MPs 8 – 14
Rural MPs 14 – 14
Wellington MPs 12 – 4
North Island MPs 49 – 42
South Island MPs 19 – 11
Cabinet Ministers 11-9
All Ministers 14-12
Gay MPs 4-0
Lesbian MPs 1-2
“Straight” MPs 63 – 51
1970s MPs 0-1
1980s MPs 5-3
1990s MPs 13-7
2002 MPs 4-2
2005 MPs 10 – 14
2008 MPs 21 – 13
2011 MPs 14 – 13

So on the 2nd ballot, 18 was the preferred choice of all demographics except Pacific MPs, MPs in their 40s, provincial MPs, rural MPs (were tied), lesbian MPs and MPs who entered in 2005.

The strongest support for 18 came from female MPs, European MPs, MPs under 40, MPs in Wellington and Christchurch, MPs from the South Island, gay MPs and MPs who entered in 2008 or 1990.