Primary sampling unit
1 = PSU 1
2 = PSU 2

1 = NE
2 = MW
3 = S
4 = W

SMSA type
1 = SMSA, central city
2 = SMSA, not central city
4 = Not in an SMSA

1 = Male
2 = Female

1 = White
2 = Black
3 = Other

1=poor,..., 5=excellent
1 = Poor
2 = Fair
3 = Average
4 = Good
5 = Excellent

Prior heart attack
0 = No heart attack
1 = Had heart attack

Diabetes status
0 = Not diabetic
1 = Diabetic

Size of place
1 = Urbanized area; 3,000,000+
2 = Urbanized area; 1,000,000–2,999,999
3 = Urbanized area; 250,000–999,999
4 = Urbanized area; <250,000
5 = Outside urbanized area; 25,000+
6 = Outside urbanized area; 10,000–24,999
7 = Outside urbanized area; 2,500–9,999
8 = Rural

0 = Male
1 = Female

0 = Not Black
1 = Black

Other race
0 = Black or White
1 = Other race

Female heart attack
0 = No
1 = Yes

0 = Urban
1 = Rural

Age group
1 = 20–29
2 = 30–39
3 = 40–49
4 = 50–59
5 = 60–69
6 = 70+

High lead level
0 = lead<25
1 = lead>=25