Table 1

Details of study population

Special schools population Regular schools population Total
Total boys in schools contacted2707133 091135 798
Total No of schools contacted50759809
Total schools participating49478527
% of schools participating986365
Total boys in participating schools263279 66282 294
SEN boys offered test169637555451
SEN boys tested124124973738
% uptake of test736669
Samples from mothers94320252968
% mothers of boys tested768179