Table 1.

Descriptive statistics

	Women					Men
	Z = 0		Z = 1			Z = 0		Z = 1
	Mean	SD	Mean	SD	Diff. p	Mean	SD	Mean	SD	Diff. p
Age	28.2	4.46	28.2	4.45	.73	30.7	4.74	30.7	4.75	.10
Years of Schooling	12.2	2.72	12.2	2.72	.89	12.6	2.93	12.6	2.90	.27
Married	0.15	0.36	0.15	0.36	.44	0.15	0.35	0.15	0.35	.55
Region of Origin
Western Europe and North America	0.061	0.24	0.060	0.24	.20	0.057	0.23	0.057	0.23	.57
East and Central Europe	0.0054	0.073	0.0052	0.072	.18	0.0062	0.078	0.0058	0.076	.06
Africa	0.0048	0.069	0.0048	0.069	.77	0.0066	0.081	0.0063	0.079	.16
Asia	0.018	0.13	0.018	0.13	.95	0.017	0.13	0.017	0.13	.26
South America	0.0019	0.043	0.0019	0.044	.61	0.0020	0.045	0.0020	0.045	.82
Earnings	2.48	2.18	2.48	2.16	.77	5.80	3.32	5.83	10.90	.19
IVF Treatment	0.0022	0.047	0.0023	0.048	.38	0.0027	0.051	0.0029	0.054	.09
N	318,144		318,890			305,040		305,508

Note: The sample is all men and women who had a second child in Norway between 1970 and 2001.