TABLE 1.

Study Population Demographics

Characteristic	Entire Study Population	No Smokers Living in the Home	Smokers Living in the Home	P
n	117	93	24
Demographics
Gender, % male	64.1	63.4	66.7	.77
Age, y				.14
Mean ± SD	1.23 ± 0.71	1.27 ± 0.73	1.03 ± 0.56
Median (IQR)	1.05 (0.70–1.53)	1.07 (0.76–1.69)	0.92 (0.58–1.18)
Range	0.12–2.92	0.12–2.92	0.50–2.52
Race, % nonwhite	64.4	62.4	70.8	.44
Gestation, wks
Mean ± SD	27.2 ± 3.1	27.3 ± 3.1	27.1 ± 3.2	.88
Median (IQR)	26.9 (24.9–28.1)	26.9 (25.0–28.1)	26.9 (24.5–28.8)
Range	22.9–35.0	23.0–35.0	22.9–35.0
Birth weight, g
n	115	92	23
Mean ± SD	1017 ± 479	1016 ± 468	1018 ± 530	.99
Median (IQR)	879 (690–1220)	855 (709–1220)	880 (680–1100)
Range	390–2650	390–2650	415–2610
Birth weight, percentile
n	115	92	23
Mean ± SD	42.4 ± 25.0	42.2 ± 25.5	43.4 ± 23.2	.83
Median (IQR)	43 (22–60)	42.5 (22–61.5)	45 (28–55)
Range	1–90	1–90	1–89
Socioeconomic status
Median household income ($, thousands)
Mean ± SD	66.2 ± 23.4	68.8 ± 23.2	57.2 ± 22.3	.031
Median (IQR)	62.6 (50.9–80.4)	67.4 (53.0–81.7)	52.4 (39.3–80.0)
Range	25.2–156.6	25.2–156.6	25.2–100.6
Public insurance, %	60.7	57.0	75.0	.11
High school education or less, %	25.4a	20.0b	45.8	.010
Clinical characteristics
Age at discharge from NICU, mo
Mean ± SD	4.2 ± 3.1	4.3 ± 3.4	3.8 ± 1.6	.52
Median (IQR)	3.6 (2.5–4.8)	3.5 (2.4–4.9)	3.6 (2.9–4.6)
Range	0.2–24.4	0.4–24.4	0.4–8.7
Home supplemental oxygen, %	41.0	44.1	29.2	.19
Home ventilator, %	5.1	5.4	4.2	.81
Gastrostomy tube, %	29.1	31.2	20.8	.32
Nissen, %	17.1	19.3	8.3	.20
Inhaled corticosteroid use before age 2 y, %	85.5	83.9	91.7	.33
Technology dependent,a %	53.0	55.9	41.7	.21

IQR, interquartile range.

^an = 114.

^bn = 90.

^cPresence of any of the following: home supplemental oxygen, home ventilator, gastrostomy tube, or Nissen fundoplication.