The answer is may be, but it's not that simple.
The figure shows when participants of our trial were registered with MEBO - before or after the first stages of our uBiome study.
Percentage of those who did not return any samples (red squares) was 30% for those who participated in prior MEBO activities
vs 40% for newly signed individuals.
(The ratio of our Study "Stars" (those who returned all kits and answered all associated QoL questions ) vs those who did not return the kits was 60% for "old friends" vs 80% for "new friends").
Yet, the figure shows that
"stars" (green circles) and "no-shows" (red squares) tend to "cluster", and possibly associate together. Perhaps associations are indicators of the values we value? Show me your true friends and I'll tell you who you are?