Table 16.

Revised novel parameterization of the fraternal birth order effect in men

						95% CI
	b	SE	Z	p	OR	Lower	Upper
Intercept	1.73	0.42	4.13	< .001	5.65	2.49	12.86
Sibship size	− 0.21	0.08	− 2.53	.011	0.81	0.69	0.95
Maternal older siblings	0.50	0.11	4.47	< .001	1.65	1.33	2.06
Maternal older sisters	− 0.23	0.12	− 1.96	.050	0.79	0.63	1.00
Maternal younger sisters	− 0.20	0.12	− 1.62	.106	0.82	0.65	1.04
Age	− 0.00	0.00	− 0.80	.423	1.00	0.99	1.01
Mother’s age at target’s birth	− 0.06	0.01	− 4.67	< .001	0.94	0.91	0.96

Estimates represent the log odds using heterosexuals as a referential value