National Survey of Health and Development
1957 (Age 11)
Codes
Name
ALS57
-
-9999 
Unknown -
-9899 Unknown -
-9799 Not attending school -
0 Don't know, depending on exam result, as long as possible -
1 15 years -
2 16 years -
3 17 years -
4 18 years or over -
9 Not attending school