Study	Reason for exclusion
Bettigole 1981	Single dose data reported for episiotomy and uterine cramping combined. No single dose adverse event data
Burt 1982	Single blind study. Includes participants with mild baseline pain
Davie 1978	2 hour data only. Pain relief scale not standard. Baseline pain not reported
Derournay 1983	No placebo group
Gruber 1976	Includes participants with mild baseline pain
Gruber 1979	Baseline pain not reported. Pain intensity scale not standard
Kaiko 1984	No placebo group
Offen 1985	Baseline pain not reported. Includes participants with uterine cramping
Sechzer 1977	Pain intensity and patient global evaluation scales not standard
Sunshine 1978	Includes participants with somatic pain and fractures