Additional analyses
SECONDARY
It is expected that not all dyads will be adhering to the intervention; therefore, the analysis undertaken for the primary estimand will only provide an estimate of the causal effect of intervention assignment rather than an estimate of the causal effect of the intervention actually received. In a supplementary analysis, the estimate corresponding to a secondary estimand will be obtained that will apply to those dyads who would adhere under any of the three interventions rather than all randomised dyads [