Table 2.

Numbers of heterosexual and homosexual subjects in one-son and two-son families.

	first and only son		first of two sons		second of two sons
study	heterosexual	homosexual	heterosexual	homosexual	heterosexual	homosexual
Blanchard & Bogaert [13]	134	97	94	46	76	60
Blanchard et al. (B-NB) [14]	118	147	40	40	18	23
Blanchard et al. (B-O) [14]	59	87	27	32	36	54
Blanchard et al. (H) [15]	181	16	111	16	104	8
Blanchard et al. (P) [15]	41	24	34	11	15	22
Blanchard et al. (T) [15]	254	19	189	15	133	18
Blanchard et al. [16]	114	152	36	69	36	70
Ellis & Blanchard [22]	353	55	193	28	172	35
Khorashad et al. [23]	6	11	7	5	12	12
Krupp (H) (J Krupp 2014, unpublished manuscript)	47	14	14	7	10	7
Krupp (P) (J Krupp 2014, unpublished manuscript)	15	11	6	6	5	5
Schagen et al. [25]	419	27	178	23	160	27
VanderLaan & Vasey [12]	40	13	44	13	48	18
VanderLaan et al. [26]	88	140	52	75	35	78