Table 3 Between-group differences in DASH score, primary and secondary comparisons

From: Efficacy of supermarket and web-based interventions for improving dietary quality: a randomized, controlled trial

DASH score

Strategies 1 and 2 versus control mean (95% CI)

P valuea

Strategy 2 versus strategy 1 mean (95% CI)

P valueb

Change (baseline to 3 months)

4.7 (0.9, 8.5)

0.02

3.8 (0.8, 6.9)

0.01

Change (baseline to 6 months)

3.1 (−1.0, 7.3)

0.14

1.8 (−1.9, 5.5)

0.34

  1. Intervention effect is difference in mean change in outcome and 95% confidence interval.
  2. aP value from baseline to follow-up time point, whether Strategies 1 and 2 combined increased DASH score compared with control.
  3. bP value from baseline to follow-up time point, whether Strategy 2 increased DASH score compared with Strategy 1.
  4. We formally tested two hypotheses in hierarchical fashion: (1) from baseline to 3 months, whether Strategies 1 and 2 combined increased DASH score compared with controla; and (2) from baseline to 3 months, whether Strategy 2 increased DASH score compared with Strategy 1b. The second hypothesis was tested only if P < 0.05 was met for the first hypothesis. No other adjustments for multiple comparisons were made.
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