Table 1. Serum CK activities in all of the screen-positive cases at the 6- to 8-week follow-up appointment.

	Serum CK activities (U/l)
	Mean	Median	Lowest	Highest
DMD (n=56)	8052	8200	2442	14 200
BMD (n=5)	5595	3933	780	13 732
Other dystrophies (n=5)	4205	2162	735	13 000
Transient cases (n=79)	121	115	31	280