In a study conducted in 2001, pain of active phase was
compared in two groups of optional and routine positions.
In the group of optional position, 10% selected sitting
position, 4% standing position, and 36% selected a
combined position. The rest of the subjects were put in
routine position group. Mean pain severity score was less
in optional position group compared to routine position
group. About 16% of combined position group and 46% of
routine position group expressed their pain as the worst.[22]