Table 1. The mutations in CYP21A2 and their phenotypes according to their residual activities based on in vitro transfection assay.

	Group A	Group B	Group C
Phenotype	Salt-wasting	Simple virilizing	Nonclassic
In vitro activity of CYP21A2	0%–1%	1%–10%	20%–60%
Mutation	Gene deletion/conversion	p.I172N	p.P30L
	8 bp deletion E3		p.V281L
	E6 cluster		p.P453S
	F306+t
	L307insT
	p.Q318*
	p.R356W