Table 1.

Incidence and severity of postoperative pain in three surveys conducted in the U.S.

Pain experience	Warfild et al. (5) (%)	Apfelbaum et al. (6) (%)	Gan et al. (7) (%)
Any pain	77	82	86
Slight pain	19	13	24.5
Moderate pain	49	47	44.8
Severe pain	23	21	22.6
Extreme pain	8	18	8.2