Table 4.

Fraternal birth order effect in men

						95% CI
	b	SE	Z	p	OR	Lower	Upper
Intercept	1.77	0.42	4.16	< .001	5.86	2.55	13.47
Maternal younger brothers	− 0.20	0.08	− 2.43	.015	0.82	0.70	0.96
Maternal younger sisters	− 0.39	0.10	− 4.07	< .001	0.67	0.56	0.82
Maternal older brothers	0.30	0.09	3.50	< .001	1.35	1.14	1.60
Maternal older sisters	0.07	0.08	0.85	.395	1.07	0.91	1.27
Nonmaternal younger brothers	0.00	0.12	0.02	.986	1.00	0.79	1.27
Nonmaternal younger sisters	− 0.14	0.17	− 0.82	.413	0.87	0.63	1.21
Nonmaternal older brothers	0.07	0.17	0.40	.693	1.07	0.77	1.48
Nonmaternal older sisters	0.34	0.17	1.98	.047	1.41	1.00	1.97
Age	0.00	0.00	− 0.72	.473	1.00	0.99	1.01
Mother’s age at target’s birth	− 0.07	0.01	− 4.82	< .001	0.94	0.91	0.96

Estimates represent the log odds using heterosexuals as a referential value