Return of diaries
REGRESSION
Twenty-six of the twenty-eight (93%) sites that recruited at least one participant returned one or more diaries; the proportion returned varied from 0 to 1.0 within both intervention groups reflecting the small number recruited per site (Table Linear regression analysis adjusted for cluster pair (unweighted) gave a mean difference in the proportion of diaries returned between interventions of − 0.09, 95% CI (− 0.29, 0.10), 