The Editor-in-Chief would like to apologise for an error in the statistical presentation in the two publications above (Chaudhry & Pereira, Reference Chaudhhry and Pereira2009a; Reference Chaudhhry and Pereira2009b).
p = 0.000 should have appeared as p < 0.001 throughout.
This error was an oversight of the Editor-in-Chief 's office making adjustment before press and not the statistics referees report.