Among its 10,486 subjects, 7,157 (68.3%) endured
the entire 106-second immersion. The resulting frequency
distribution is therefore severely right censored,
as expected with an upper time limit cutoff. However, it
is highly unlikely that extending this limit would significantly
normalize the data set, because pain ratings do
not increase noticeably after the first 60 seconds, and
for some participants, the pain ratings actually decrease
(data not shown).