Reliability of the INVR was assessed with Cronbach
alpha coefficients. Coefficients were consistently
high, with alpha of 0.93 at day 1, 0.89 for
each of days 2—4, and 0.85 at day 5.
Nausea, vomiting and retching experience
Nausea was experienced significantly less often
in the experimental group compared to the control
group (F = 21.6, P < 0.001) across the five
assessment days. Only at day 3 both groups
had similar levels of nausea (Table 2). Similar
results were observed with regards to retching
experienced (F = 5.8, P = 0.02). Vomiting experience
closely approached significance (F = 3.8,
P = 0.06) although the power observed for this
particular result was low at 0.47 (Table 2). Total
experience of nausea, vomiting and retching (all
items of the scale) was also significantly better
in the experimental group (F = 13.3, P = 0.001)
(Fig. 2).
Figure