Geschlecht Kind
1 = male
2 = female

Schulklasse Kind (3 oder 4)
3 = 3. Klasse
4 = 4. Klasse

Bundesland
1 = Bayern
2 = Hessen

0 = Incomplete
1 = Unverified
2 = Complete

Does it concern a twin sibling?
0 = no
1 = yes

Cody Reaktionszeit example item 1, true or false
0 = false
1 = true