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Fig. 4. The distribution of cluster sizes for each treatment group compared with a
Poisson (random) distribution. The frequency of cluster sizes for the (A)
T3-implanted group (black bars) and the (B) placebo group (black
bars) compared with a frequency distribution generated by a truncated Poisson
process (gray bars in A and B). Both distributions are significantly different
from random (T3 implant,
2=12.6697,
P=0.0004; placebo,
2=7.0978, P=0.008).