Table 3.

Sinnecker’s Score*

Phenotype	Subtype	Likert-Scale Classification	Characteristics
Male	1a	1	No overt undermasculinization
Male	1b	2	Impaired spermatogenesis
Predominantly male	2a	3	Isolated hypospadias
Predominantly male	2b	4	Micropenis and severe hypospadias, bifid scrotum
Ambiguous	3a	5	Microphallus, perineoscrotal hypospadias
Ambiguous	3b	6	As 3a but sinus urogenitalis with a short, blind ending vagina
Predominantly female	4a	7	Clitoromegaly and labial fusion, blind ending vagina, sinus urogenitalis with a wide opening
Predominantly female	4b	8	Slight signs of androgen effects. Slight clitoromegaly or partial labial fusion, distinct urethral and vaginal opening
Female	5	9	No signs of virilization

Notes: *Adapted from Sinnecker GH, Hiort O, Dibbelt L, et al. Phenotypic classification of male pseudohermaphroditism due to steroid 5 alpha-reductase 2 deficiency. Am J Med Genet. 1996;63(1):223–230.9