Study	Reason for exclusion
Bornfleth 1981	No 6 hour data
Burguet 1989	No placebo arm, not single dose
Cutting 1980	Not postoperative pain, no placebo arm
Giudice 1987	No placebo arm
Lecointre 1991	No placebo arm (tiaprofenic acid versus paracetamol)
Massin 1985	Peri‐operative therapeutic plan (2 days before and 6 days after operation)
Ormiston 1981	No placebo arm
Salvato 1992	No placebo arm. Open design
Trop 1983	Not standard scale, and patients not necessarily with at least moderate pain
van der Aa 1984	No placebo arm (tiaprofenic acid vs indomethacin)
van der Westhuijzen 1994	Intramuscular injection during surgery