Table 2.
Understanding of the Information by Message Delivery
| Standard (SI) | Interactive (IPI) | Mean difference (95% CI) | |
|---|---|---|---|
| Baseline understanding (Pre-test) | 6.47 ± 2.5 | 6.57 ± 2.4 | 0.1 (−0.7, 0.9) |
| Post-test 1 (after intervention) | 7.35 ± 2.5 | 8.28 ± 2.4*† | 0.93 (0.1, 1.7) |
| Low literacy | 5.14 ± 2.7 | 6.40 ± 2.6 | 1.26 (−2.2, 4.8) |
| High literacy | 7.83 ± 2.2‡ | 8.55 ± 2.3‡ | 0.7 (−0.6, 1.5) |
| Low numeracy | 6.75 ± 2.5 | 7.63 ± 2.5 | 0.8 (−0.6, 2.4) |
| High numeracy | 7.87 ± 2.3 | 8.72 ± 2.3 | 0.8 (−0.1, 1.8) |
| ≤ High school education | 6.80 ± 2.8 | 6.76 ± 2.3 | −0.04 (−1.7, 1.6) |
| > High school education | 7.66 ± 2.3 | 8.77 ± 2.3*$ | 1.1 (0.2, 1.9) |
| Post-test 2 (2 wks after intervention) | 6.69 ± 2.5 | 7.60 ± 2.2* | 0.91 (0.08, 1.7) |
| “Complete” Post-test 1understanding of: | |||
| Indications for cardiac catheterization | 79.2 | 83.8 | |
| Procedure | 33.8 | 47.3 | |
| Risks | 57.1 | 70.3 | |
| Benefits | 59.7 | 64.9 | |
| Alternatives to cardiac catheterization | 9.1 | 25.7* | |
Data are presented as % and mean ± SD (based on a scale of 0–12, where 12 = Complete understanding). SI = Standard information, IPI interactive iPad information. CI = Confidence intervals
Low numeracy = 0–35, High numeracy = >35 on the Subjective Numeracy Scale
Low Literacy = 0–60 (3rd – 8th grade equivalence), High Literacy = >60 (9th grade equivalence or higher)
*
P< 0.05 vs Standard,
†
P< 0.05 vs Pre-test,
‡
P<0.05 vs Low literacy,
$
P < 0.01 vs ≤ High school