Table.

The distribution (%) by study group, plurality, and checkbox item on the birth certificate^*

		IVF Children	IVF Siblings	Control Children
	Overall	69,969	9,489	636,645
	Singleton births	47,737	8,890	623,030
	Multiple births	22,232	599	13,615
Q1: Pregnancy resulted from infertility treatment	Overall	36.8	14.1	0.8
	Singleton births	33.8	12.3	0.6
	Multiple births	43.0	38.4	8.9
Q2: Fertility-enhancing drugs, AI, or IUI	Overall	11.5	6.2	0.4
	Singleton births	10.1	5.2	0.3
	Multiple births	14.4	20.6	5.3
Q3: Assisted reproductive technology, IVF, or GIFT	Overall	28.2	5.5	0.3
	Singleton births	26.0	4.9	0.2
	Multiple births	33.0	15.0	4.0
Summary: any infertility item checked ‘Yes’**	Overall	36.5	12.8	0.7
	Singleton births	33.3	11.1	0.5
	Multiple births	43.4	37.1	8.7

^*Percents were computed from the years that the item was present; States may not have included all items on the birth certificate.

^**The response is included in the summary when at least one of the three items was present on the birth certificate.