Table 2. Confidence in Ability to Change Eating Habits From Baseline (March 2010) to Follow-up (June 2010), Dietary Approaches to Stop Hypertension (DASH) Feasibility Study, North Carolina, 2010.
| Factora | All | Control | Intervention | P Valueb | Intervention Effect Estimate, Mean (SD)c | P Value for Effectc |
|---|---|---|---|---|---|---|
| Confidence in ability to reduce dietary salt | ||||||
| Baseline | 21.2 (3.8) | 21.5 (4) | 21.0 (4) | .73 | +3.3 (1.4) | .03 |
| Follow-up | 21.6 (3.8) | 19.8 (5) | 23.1 (2) | .03 | ||
| Confidence in ability to reduce dietary fat | ||||||
| Baseline | 22.1 (2.7) | 22.5 (2) | 21.9 (3) | .59 | +2.2 (0.9) | .02 |
| Follow-up | 22.3 (2.6) | 21.3 (3) | 23.2 (2) | .07 | ||
| Confidence in ability to eat healthier snacks | ||||||
| Baseline | 19.8 (3) | 19.5 (3) | 20.0 (3) | .20 | +2.8 (1.1) | .02 |
| Follow-up | 19.8 (3.5) | 18.0 (3) | 21.2 (3) | .02 | ||
| Confidence in ability to stick with the DASH diet after study conclusion | ||||||
| Baseline | 36 (3.7) | 36.8 (2) | 35.4 (5) | .34 | +1.7 (1.1) | .14 |
| Follow-up | 36.7 (2.8) | 36.1 (3) | 37.5 (3) | .20 | ||
Summary scales were created from a 28-item survey. Original survey items were coded using a Likert scale that ranged from 1 (I know I cannot) to 5 (I know I can). Each factor included 5 to 8 survey items; items were summarized to create a single factor value. Scale ranged from 25 to 40, based on the number of survey items included in the summary scale. Scales for confidence in ability to reduce dietary salt and dietary fat and to increase healthy snack consumption included 5 original survey items. The scale for confidence in the ability to adhere to the DASH diet after study conclusion included 8 original survey items.
Differences between intervention and control groups determined by analysis of covariance, adjusted for baseline measures.
Based on linear regression (12 weeks as outcome variable and baseline and randomization arm as predictors).