[Retracted] Antenatal Steroid Therapy for Fetal Lung Maturation and the Subsequent Risk of Childhood Asthma: A Longitudinal Analysis

Table 1

Descriptive characteristics of the study sample by asthma status.

	Asthma
	No			Yes			Total
		%			%
	Num	Row	Column	Num	Row	Column	Num	%${}^{*}$
Total	59,975	74.6	100.0	20,473	25.4	100.0	80,448	100.0
Birth year
1989	3,823	65.1	6.4	2,051	34.9	10.0	5,874	7.3
1990	5,816	66.5	9.7	2,931	33.5	14.3	8,747	10.9
1991	5,671	67.2	9.5	2,773	32.8	13.5	8,444	10.5
1992	6,020	71.7	10.0	2,374	28.3	11.6	8,394	10.4
1993	6,135	74.0	10.2	2,152	26.0	10.5	8,287	10.3
1994	6,524	75.9	10.9	2,067	24.1	10.1	8,591	10.7
1995	6,503	77.4	10.8	1,896	22.6	9.3	8,399	10.4
1996	6,793	80.7	11.3	1,629	19.3	8.0	8,422	10.5
1997	6,465	81.8	10.8	1,440	18.2	7.0	7,905	9.8
1998	6,225	84.3	10.4	1,160	15.7	5.7	7,385	9.2
Antenatal steroid exposure	773	68.1	1.3	362	31.9	1.8	1,135	1.4
Number of siblings
0	25,916	72.2	43.2	9,972	27.8	48.7	35,888	44.6
1	21,753	75.1	36.3	7,199	24.9	35.2	28,952	36.0
2	8,691	78.1	14.5	2,435	21.9	11.9	11,126	13.8
3+	3,608	80.7	6.0	864	19.3	4.2	4,472	5.6
Preterm birth (<37 weeks)	2,534	68.1	4.2	1,189	31.9	5.8	3,723	4.6
Caesarean section	10,873	71.9	18.1	4,253	28.1	20.8	15,126	18.8
Income
Quintile 1	12,693	73.6	21.5	4,547	26.4	22.7	17,240	21.4
Quintile 2	12,619	74.3	21.4	4,359	25.7	21.7	16,978	21.1
Quintile 3	11,368	75.2	19.3	3,749	24.8	18.7	15,117	18.8
Quintile 4	12,435	74.6	21.1	4,235	25.4	21.1	16,670	20.7
Quintile 5	9,873	75.7	16.7	3,174	24.3	15.8	13,047	16.2
Surfactant administration	139	59.9	0.2	93	40.1	0.5	232	0.3
1 Minute Apgar score
0–3	1,309	70.4	2.2	550	29.6	2.7	1,859	2.3
4–6	4,375	71.9	7.3	1,712	28.1	8.4	6,087	7.6
7–10	54,070	74.9	90.5	18,137	25.1	88.9	72,207	89.8
Maternal smoking	16,421	72.6	27.4	6,211	27.4	30.3	22,632	28.1
Married/Common law	42,671	74.6	71.1	14,566	25.4	71.1	57,237	71.1
Hyaline membrane disease	672	62.3	1.1	406	37.7	2.0	1,078	1.3
Bronchopulmonary dysplasia	97	54.2	0.2	82	45.8	0.4	179	0.2
Duration: weeks (mean, SD)	512.3	155.3		287.2	116.6		455.0	176.2
Birth weight: grams (mean, SD)	3,487.4	554.7		3,444.3	592.1		3,476.5	564.7
Gestational age: weeks (mean, SD)	39.5	1.7		39.3	1.9		39.4	1.7
Maternal age: years (mean, SD)	26.7	5.3		26.4	5.2		26.6	5.3

Note: All totals do not add to grand total given missing values for some variables.
${}^{*}$Percent of total cohort.