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Table 4 Analyses of primary aims

From: Facilitating HIV/AIDS and HIV testing literacy for emergency department patients: a randomized, controlled, trial

Primary aims Measurements Analytic methods
Aim 1. Short-term improvement in HIV/AIDS and HIV testing knowledge
HA1: 3-way interaction (mode*language*literacy level)
HA2: 2-way interaction (mode*language or literacy level)
HA3: no interaction (difference by mode only)
HA4: no difference
HIV/AIDS and HIV testing knowledge questionnaire at baseline in ED at time of HIV testing, post- vs. pre-information delivery • Paired t-tests
• Signed-rank tests
• MANOVA/ANCOVA
• Generalized linear mixed-effects regression
Aim 2. Retention of HIV/AIDS and HIV testing knowledge at 3, 6, 9, and 12 months
HA1: 3-way interaction (mode*language*literacy level)
HA2: 2-way interaction (mode*language or literacy level)
HA3: no interaction (difference by mode only)
HA4: no difference
HIV/AIDS and HIV testing knowledge questionnaire at 3, 6, 9, and 12 months vs. baseline (post-information delivery) • Paired t-test for each follow-up vs. baseline
• Linear mixed-effects regression (assuming constant degradation over time)
• Broken-stick linear mixed-effects regression (for non-constant degradation over time)