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Table 1

Descriptive statistics for sample compared with average Danish parents who had a child in 1995

	Danish Population	Full DALSC	Estimation Sample	p ValuePopulation vs. Full	p Value Population vs. Sample	p Value Full vs. Sample
Older Siblings	.566	.618	.580	.001	.001	.001
	(.496)	(.486)	(.494)
In Relationship as of January 1, 1995	.854	.926	.968	.001	.001	.001
	(.353)	(.261)	(.176)
Birth Weight (kg)	3.484^a	3.510^c	3.520^f	.001	.001	ns
	(0.598)	(0.605)	(0.603)
Mother’s Age at Birth	28.250	30.173^d	29.315	.001	.001	.001
	(4.688)	(4.674)	(4.552)
Mother’s Years of Education	12.312^b	12.491^e	12.634^g	.001	.001	.001
	(2.272)	(2.200)	(2.157)
Infantile Colic		.133	.146			ns
		(.340)	(.353)
Smoking When Child Is 6 Months		.277	.294			ns
		(.448)	(.456)
Relationship Length in Years			7.345
			(4.163)
N	67,657	5,666	4,920

	Danish Population	Full DALSC	Estimation Sample	p ValuePopulation vs. Full	p Value Population vs. Sample	p Value Full vs. Sample
Older Siblings	.566	.618	.580	.001	.001	.001
	(.496)	(.486)	(.494)
In Relationship as of January 1, 1995	.854	.926	.968	.001	.001	.001
	(.353)	(.261)	(.176)
Birth Weight (kg)	3.484^a	3.510^c	3.520^f	.001	.001	ns
	(0.598)	(0.605)	(0.603)
Mother’s Age at Birth	28.250	30.173^d	29.315	.001	.001	.001
	(4.688)	(4.674)	(4.552)
Mother’s Years of Education	12.312^b	12.491^e	12.634^g	.001	.001	.001
	(2.272)	(2.200)	(2.157)
Infantile Colic		.133	.146			ns
		(.340)	(.353)
Smoking When Child Is 6 Months		.277	.294			ns
		(.448)	(.456)
Relationship Length in Years			7.345
			(4.163)
N	67,657	5,666	4,920

^aN = 67,080.

^bN = 66,437.

^cN = 5,124.

^dN = 5,588.

^eN = 5,552.

^fN = 4,919.

^gN = 4,854.