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Table 2 Minimum meaningful differences between control and intervention groups, and those detectable with 80% power, 5% significance (two-tailed) for endpoint sample size of 265 per group, assuming a design effect of 2.9.

From: The NOURISH randomised control trial: Positive feeding practices and food preferences in early childhood - a primary prevention program for childhood obesity

Intake Prevalence # Detectable Behaviour Prevalence # Detectable
Fruita 82 vs ≥ 95%(iii) 82 vs ≥ 95% Offer new food >10 timesb 28 vs ≥ 75%(iii) 28 vs ≥ 48%
Vegetablea 67 vs ≥ 95%(iii) 67 vs ≥ 84% Refuses food- assume not hungry, take food away often/very often/alwaysb 56 vs ≥ 84%(i) 56 vs ≥ 75%
Salty snacksa 27 vs ≤ 17%(ii) 27 vs ≤ 11% Refuses food-offers no replacement food often/very often/alwaysb 29 vs ≥ 44%(i) 29 vs ≥ 49%
Sweet beveragesa 44 vs ≤ 28%(ii) 44 vs ≤ 25% Use food as reward 'hardly ever'b 55 vs ≥ 83%(i) 55 vs ≥ 74%
Fried potatob 17 vs ≤ 8%(i) 17 vs ≤ 5% Insist child eat 'hardly ever'b 46 vs ≥ 69%(i) 46 vs ≥ 66%
  1. # Prevalence = proportion of children consuming food on day of record - Anticipated and a priori defined meaningful differences in control versus active groups; Control prevalences are based on descriptive cross-sectional data from (a) FITS[14] or (b) our pilot study for infants 19-24 or 12-36 months respectively. Criteria to estimate expected differences (in direction of desirable intake/behaviour) were (i) relative increase/decrease of 50% (ii) equivalent to intake at 9-12 months or (iii) increase/decrease to optimal.