The final version of the BBAT is shown in Fig. 1.
Mothers in the trial had a mean age of 33 years, 58% of the
infants in the trial were first-born and they were recruited at a
mean age of five days. Non-trial infants (n¼112) had a wider age
range (from one day to 10 weeks old) with a mean age of 17 days,
but other characteristics were similar to those in the trial.