Table 1.

Definitions applied to the Hearing for Learning Initiative SW-CRT (see Fig. 1)

Cluster (unit of randomisation)	18 Northern Territory Aboriginal communities (clusters) allocated 2:4:4:4:4 to 5 start dates (sequences). Stratified by NT region (Top End or Central) and size (large or small)
Cluster period (a grouping of observations by time of measurement and cluster)	7 including baseline (i.e. 1 baseline, 5 training or transitions, and 6 Initiatives). Each cluster period has a duration of 6 months
Number of sequences	5 sequences. The order of sequence is 0111111, 0011111, 0001111, 0000111 and 0000011 (0 = control and 1 = initiative)
Number of clusters randomised to each sequence	Variable (2 in 1 sequence and 4 in 4 sequences)
Number of time periods	7 including baseline
Duration of time between each step	6 months
Transition period	3-month training period