Table 1

Weighted descriptive statistics

Variable	Median	Per cent	Min.	Max.
C reactive protein (mg/L)*	0.3		0.1	10
Family socioeconomic status
Parental education
Less than high school degree		20	0	1
High school degree		24	0	1
Some college		30	0	1
College graduate		26	0	1
Family income-to-poverty ratio†	2.3		0	5
Poor (<1×FPL)		21	0	1
Low income (1–2×FPL)		24	0	1
Moderate income (2.1–3.9×FPL)		29	0	1
High income (≥4×FPL)		26	0	1
Child characteristics
Age in years	10		2	18
Recent head or chest cold		23	0	1
Recent influenza, pneumonia, ear infection		6	0	1
Recent stomach or intestinal illness		9	0	1
BMI z-score	0.4		−4.9	4.6
Male		52	0	1
Non-Hispanic white		61	0	1
Hispanic		19	0	1
African-American		13	0	1
Other race		7	0	1
Household respondent characteristics
Age	40		20	80
Male		52	0	1
US born		81	0	1
Married		70	0	1
Cohabiting		4	0	1
Single		7	0	1
Divorced/separated		17	0	1
Widowed		2	0	1
Household size	4		2	7

Children age 2–18 years with CRP ≤10 mg/L, NHANES 1999–2010. N=13 165.
*Those missing CRP values did not differ from the analytical sample by family socioeconomic status, race/ethnicity or other social characteristics. Missing CRP children did have a significantly lower age (median 7 years) and slightly lower BMI z-score (median 0.3) than sample children.
†Capped at 5.
BMI, body mass index; CRP, C reactive protein; FPL, federal poverty line; NHANES, National Health and Nutrition Examination Surveys.