1 = Female
2 = Male

1 = Single parent (natural or otherwise)
2 = Two parents (natural or otherwise)
3 = Other

1 = 0-10 books
2 = 11-25 books
3 = 26-100 books
4 = 101-200 books
5 = 201-500 books
6 = More than 500 books

1 = Never or hardly ever
2 = Once or twice a month
3 = Once or twice a week
4 = Almost every day
5 = Every day