Race/ethnicity of child (DMARETHN)
1 = Non-Hispanic white
2 = Non-Hispanic black
3 = Mexican-American
4 = Other

Gender of child (HSSEX)
1 = Male
2 = Female

Number of persons in the household/dwelling (HSHSIZER)
10 = 10+

Family income, unimputed (HFF19R)
0 = No income
1 = Less than $1000 (including loss)
2 = $ 1,000 - 1,999
3 = $ 2,000 - 2,999
4 = $ 3,000 - 3,999
5 = $ 4,000 - 4,999
6 = $ 5,000 - 5,999
7 = $ 6,000 - 6,999
8 = $ 7,000 - 7,999
9 = $ 8,000 - 8,999
10 = $ 9,000 - 9,999
11 = $10,000 - 10,999
12 = $11,000 - 11,999
13 = $12,000 - 12,999
14 = $13,000 - 13,999
15 = $14,000 - 14,999
16 = $15,000 - 15,999
17 = $16,000 - 16,999
18 = $17,000 - 17,999
19 = $18,000 - 18,999
20 = $19,000 - 19,999
21 = $20,000 - 24,999
22 = $25,000 - 29,999
23 = $30,000 - 34,999
24 = $35,000 - 39,999
25 = $40,000 - 44,999
26 = $45,000 - 49,999
27 = $50,000 and over
88 = Blank but applicable
99 = Don't know

Did mother smoke while pregnant with child (HYA3)
1 = Yes
2 = No
8 = Blank but applicable
9 = Don't know

1 = <.5
2 = .5-1.0
3 = 1.0-1.85
4 = 1.85-3.0
5 = 3.0+