Table 2.

Comparison of Changes from Baseline to Early and Late Understanding between the ICI and SI groups.

Tests	Standard (SI)	Interactive (ICI)	Mean difference (95% CI)
Baseline understanding (before ICI or SI)	6.8 ± 2.4	6.9 ± 2.9	0.16 (−0.07, 1.1)
Early understanding (after ICI or SI)	8.1 ± 2.3	9.3 ± 2.2*	1.2 (0.4, 1.9)
“Complete” early understanding of the:
Medical indication for catheterization	67.7%	76.8%
Purpose of catheterization	70.8%	83.8%
Catheterization protocol	41.5%	53.6%
Risks	23.1%	53.6%*
Benefits	47.7%	49.3%
Options for treatment	46.2%	63.2%*
Late understanding (2 wks after ICI or SI)	7.9 ± 2.2	8.6 ± 2.7	0.65 (−0.4, 1.7)
Δ Baseline – Early understanding	1.3 ± 2.5	2.2 ± 2.1*	0.81 (0.01, 1.6)
Δ Baseline – Late understanding	1.2 ± 1.9	1.4 ± 2.3	0.24 (−0.7, 1.1)
Δ Early – Late understanding	−0.2 ± 2.6	− 0.6 ± 1.8	−0.44 (−1.4, 0.5)

Data are presented as % and mean ± SD (based on a scale of 0–12, where 12 = Complete understanding). CI = Confidence interval.

Δ = Change in understanding score.

^*P< 0.05 vs Standard.