Table 1.

Summary of recordings available on UCL Department of Psychology Speech Group’s data archive. Recordings are indicated according to class (see text) and type of file available

	No of participants	No of files	No where orth avail	No where phon avail	No where phon aligned against audio
Class 1 -release 1	41/158	95/426	19/42	17/34	11/11
Class 2 - speakers who have not reached teenage, who have been recorded at all target ages they have passed through that we are continuing to see plus children who are < 8 years we are following up	7/ 21	13/57	5/7	1/1	2/2
Class 3 - available at 8-10yrs and 12yrs+	1/5	3/21	0/14	0/13	0/0
Class 4 - available at 10-12yrs and 12yrs+	7/41	20/184	6/57	6/54	0/1
Class 5 - recordings at the 3 target ages	5/24	7/142	1/63	0/44	3/69
Totals	249 61	830 138	183 31	147 24	82 16