Table 1.
Studies in the meta-analyses.
| authors | description of the sample | N complete sibling data | N 1- and 2-son families | per cent data loss |
|---|---|---|---|---|
| Blanchard & Bogaert [13] | Canadian volunteers | 736 | 507 | 31 |
| Blanchard et al. (B-NB) [14] | Canadian men (e.g. adoptees) reared in environments other than biological families: ‘Bogaert (non-biological families)’ subsample | 502 | 386 | 23 |
| Blanchard et al. (B-O) [14] | Canadian homosexual community volunteers and heterosexual university students: ‘Bogaert (Other)’ subsample | 415 | 295 | 29 |
| Blanchard et al. (H) [15] | Canadian patients referred to a specialty clinic, phallometrically diagnosed as homosexual or heterosexual hebephiles | 783 | 436 | 44 |
| Blanchard et al. (P) [15] | Canadian patients referred to a specialty clinic, phallometrically diagnosed as homosexual or heterosexual paedophiles | 242 | 147 | 39 |
| Blanchard et al. (T) [15] | Canadian patients referred to a specialty clinic, phallometrically diagnosed as homosexual or heterosexual teleiophiles | 1089 | 628 | 42 |
| Blanchard et al. [16] | British and American volunteers, from earlier studies by Siegelman [17–21] | 610 | 477 | 22 |
| Ellis & Blanchard [22] | American and Canadian volunteers | 1146 | 836 | 27 |
| Khorashad et al. [23] | Iranian homosexual male-to-female transsexuals and heterosexual cissexual psychiatric patients | 164 | 53 | 68 |
| Krupp (H) (J Krupp 2014, unpublished manuscript) | German patients self-referred for homosexual or heterosexual hebephilia or hebeteleiophilia, from the study by Beier et al. [24] | 113 | 99 | 12 |
| Krupp (P) (J Krupp 2014, unpublished manuscript) | German patients self-referred for homosexual or heterosexual paedophilia or paedohebephilia, from study by Beier et al. [24] | 55 | 48 | 13 |
| Schagen et al. [25] | Dutch biologically male, peripubertal gender-dysphoric patients and presumably cissexual heterosexual adolescent controls | 969 | 834 | 14 |
| VanderLaan & Vasey [12] | Samoan transgender same-sex-attracted males (fa'afafine) and cisgender heterosexual males | 538 | 176 | 67 |
| VanderLaan et al. [26] | Canadian children and adolescents referred to a child and adolescent gender identity clinic | 556 | 468 | 16 |