Table 2.

Summary Statistics of WIC-Eligible Children in the National Immunization Survey (NIS) Born in 2005–2014 (Income ≤ 230% of the FPL)

	WIC-Eligible Children (N = 92,335)		WIC-Eligible Participating Children (N = 71,757)		WIC-Eligible Non-Participating Children (N = 20,578)
Variables	Weighted Percentage (%) or Mean	S. E. (%)	Weighted Percentage (%) or Mean	S. E. (%)	Weighted Percentage (%) or Mean	S. E. (%)	P-value†
Gender of Child							0.7
Boys	51.0	0.3	50.9	0.3	51.2	0.6
Girls	49.0	0.3	49.1	0.3	48.8	0.6
Race/Ethnicity							< 0.001
Non-Hispanic White	35.9	0.2	31.1	0.3	59.6	0.6
Non-Hispanic Black	17.3	0.2	19.0	0.2	8.8	0.4
Hispanic	36.9	0.3	40.3	0.3	20.3	0.5
Other	9.9	0.2	9.6	0.2	11.3	0.4
Age Group							0.2
19–23m	28.5	0.3	28.6	0.3	28.3	0.5
24–29m	37.1	0.3	37.2	0.3	36.4	0.6
30–35m	34.4	0.3	34.2	0.3	35.3	0.6
Maternal Education							< 0.001
< High School	28.0	0.3	31.1	0.3	13.0	0.5
High School/GED	38.0	0.3	39.3	0.3	31.1	0.6
Non-college graduate	23.4	0.2	22.7	0.2	27.1	0.5
College graduate	10.6	0.1	6.9	0.1	28.8	0.5
Age of Mother							< 0.001
< 30 years	54.1	0.3	57.2	0.3	39.2	0.6
≥ 30 years	45.9	0.3	42.8	0.3	60.8	0.6
Maternal Marital Status							< 0.001
Married	48.9	0.3	43.8	0.3	74.2	0.6
Non-married	51.1	0.3	56.2	0.3	25.8	0.6
Interview Language							< 0.001
English	76.0	0.3	73.4	0.3	89.1	0.5
Spanish	21.1	0.3	23.8	0.3	7.5	0.4
Other	2.9	0.1	2.8	0.1	3.4	0.3
Number of Household Members	4.7	0.01‡	4.7	0.01‡	4.8	0.02‡	< 0.001

^†P-value was calculated based on Pearson’s Chi-squared test and T-test between the WIC-Eligible participating children and eligible non-participants Child.

^‡In this line, the number presents the standard error other than the percentage of standard error.