TABLE 1.

Characteristics of the Study Cohort at Enrollment (n = 1375)

	n	%
Sex
Girls	687	50.0
Boys	688	50.0
Age at enrollment,a y
0–<3	364	26.5
3–<6	381	27.7
6–<9	341	24.8
≥9	289	21.0
Race
Not White	61	4.4
White	1314	95.6
Ethnicity
Not Hispanic	1280	93.1
Hispanic	46	3.3
Missing	49	3.6
Genotype risk groupb
High risk	1074	78.1
Low risk	99	7.2
Unclassified	150	10.9
Missing	52	3.8
Diagnosis by screeningc
No	1046	76.1
Yes	297	21.6
Missing	32	2.3
Mother’s education
High school or less	387	28.1
Some college or more	951	69.2
Missing	37	2.7
Annual household income
<$40 000	368	26.8
$40 000-$79 000	437	31.8
≥$80 000	363	26.4
Missing	207	15.1
Insurance statusd
Medicaid or no insurance	602	43.8
Private or other insurance	761	55.3
Missing	12	0.9
Mother smoked during pregnancy
No	1083	78.8
Yes	189	13.7
Unknown	103	7.5
Mother smoked any time after birth of child
No	974	70.8
Yes	341	24.8
Missing	60	4.4
Household member smokes cigarettes
No	966	70.3
Yes	400	29.1
Missing	9	0.6
Child around people smoking in past 3 mo
Ever	720	52.4
Never	631	45.9
Missing	24	1.7

^aMean age at enrollment was 5.7 y (SD 3.5).

^bCFTR genotype risk group as previously described.^23,24

^cIncludes newborn or prenatal screening.

^dOther insurance includes Medicare, military insurance, and insurance not otherwise specified.