TABLE 1—

Description of Study Population (n=901): United States, 1999^a

	No.	Percentage
Education
< Ninth grade	107	12
Some high school	219	24
High school diploma	302	34
> High school	235	26
Missing data on education	38	4
Physical health problem in past 4 wk	273	30
Mental health problem in past 4 wk	249	28
Received Medicaid in last 2 y	496	72
Received welfare in last 2 y	230	28
Respondent insured	550	61
All children insured	612	68
All household members insured	460	51
Female	802	90
Race/ethnicity
Non-Hispanic White	264	29
Non-Hispanic Black	276	31
Hispanic origin	301	34
Other	19	2
Missing data on race	41	5
1-parent household	475	54
Monthly household income, $
0	249	31
0–1000	140	17
1001–3000	265	32
≥3001	163	20
Mean income	832
Missing data on income	84	9
Age, y
18–25	267	35
26–35	251	33
> 35	245	32
Mean age	32
Missing data on age	138	15
Number of children
1	367	41
2	270	30
3	161	18
≥4	103	11
Mean number of children	2.0

^aData were collected in 10 states and the District of Columbia. Patients in 2 health centers within each state were selected to participate in the study.