================================================================================ C.P. INVITE TRIAL REPORT (Closed Population Invitation Trial) ================================================================================
-------------------------------------------------------------------------------- 1. OBJECTIVE -------------------------------------------------------------------------------- To evaluate the effectiveness of targeted invitation methods within a closed population (N=500) for a controlled trial. The primary endpoint is the response rate (acceptance to participate) within 7 days. CP Invite Trial txt
Multi-channel arm reached 50% response by Day 2; single-channel arms required 4-5 days to approach 50%. The primary endpoint is the response rate (acceptance
-------------------------------------------------------------------------------- 2. METHODOLOGY -------------------------------------------------------------------------------- 2.1 Population: Closed group (registered panel members, no new entries allowed). 2.2 Sample Size: 500 individuals. 2.3 Invitation Channels (randomized equally, n=125 per arm): - Arm A: Email only - Arm B: SMS only - Arm C: In-app notification only - Arm D: Multi-channel (email + SMS reminder after 48h) 2.4 Invitation Message (standardized): "You are invited to participate in a 10-min confidential survey. Click [link] to begin. Reward: $10 gift card upon completion." 2.5 Trial Period: 7 consecutive days. 0.001 (significant) - Arm D vs.
-------------------------------------------------------------------------------- 5. TIMELINE OF RESPONSES (cumulative %) -------------------------------------------------------------------------------- Day A B C D 1 5% 18% 3% 25% 2 12% 28% 7% 45% 3 18% 35% 12% 58% 4 24% 41% 18% 65% 5 29% 45% 24% 69% 6 32% 47% 28% 70% 7 34% 49% 30% 71%
Average response rate across arms: 46.0%
-------------------------------------------------------------------------------- 4. STATISTICAL SIGNIFICANCE (Chi-square test) -------------------------------------------------------------------------------- - Arm D vs. Arm A: p < 0.001 (significant) - Arm D vs. Arm B: p = 0.002 (significant) - Arm D vs. Arm C: p < 0.001 (significant) - Arm B vs. Arm A: p = 0.021 (significant) - Arm B vs. Arm C: p = 0.004 (significant) - Arm A vs. Arm C: p = 0.612 (not significant)