Table 4.
Estimated Mean PAM and 95% Confidence Intervals for Participants According to Baseline Numeric and Reading Literacy Classification (n = 417)
| Time/group | Intervention (95% CI) | Usual care (95% CI) | Difference, intervention vs usual care (95% CI) | Differential effect of intervention (low vs high); p value |
|---|---|---|---|---|
| Numeracy | ||||
| Baseline* | ||||
| Low | 59.2 (57.6, 60.9) | 59.2 (57.6, 60.9) | ||
| High | 63.9 (62.2, 65.6) | 63.9 (62.2, 65.6) | ||
| Week 6 | ||||
| Low | 61.0 (58.6, 63.5) | 60.9 (58.6, 63.3) | 0.07 (− 3.2, 3.3) | − 2.8 (− 7.3, 1.7); p = 0.22 |
| High | 65.4 (63.0, 67.8) | 62.6 (60.2, 64.9) | 2.9 (− 0.3, 6.0) | |
| Month 6 | ||||
| Low | 63.9 (61.4, 66.4) | 63.7 (61.4, 66.1) | 0.15 (− 3.1, 3.4) | − 4.6 (− 9.1, − 0.15); p = 0.04 |
| High | 68.8 (66.4,71.2) | 64.0 (61.6, 66.4) | 4.8 (1.7, 7.9) | |
| Literacy | ||||
| Baseline* | ||||
| Low | 57.4 (55.2, 59.5) | 57.4 (55.2, 59.5) | ||
| High | 63.3 (61.9, 64.7) | 63.3 (61.9, 64.7) | ||
| Week 6 | ||||
| Low | 60.3 (57.2, 63.5) | 58.6 (55.7, 61.5) | 1.7 (− 2.3, 5.8) | 0.4 (− 4.5,5.2); p = 0.89 |
| High | 64.5 (62.4, 66.6) | 63.1 (61.2, 65.1) | 1.4 (− 1.4, 4.1) | |
| Month 6 | ||||
| Low | 63.6 (60.4, 66.8) | 60.6 (57.7, 63.6) | 3.0 (− 1.1, 7.0) | 0.7 (− 4.1,5.5); p = 0.78 |
| High | 67.5 (65.5, 69.6) | 65.3 (63.2, 67.3) | 2.3 (− 0.4, 5.0) | |
*As recommended for the analysis of randomized trials42 to improve efficiency, the longitudinal model constrained the intercept to be the same for intervention and usual care groups