Study	Reason for exclusion
Creatsas 1998	Study participants did not have dysmenorrhoea
Foidart 2000	Only small number of women with dysmenorrhoea included in the study.
Iannotti 1991	Not a randomised or controlled clinical trial. No information on the oestrogen/progestagen compound used. Trial published in Italian, translated by Riccardo Fontani.
Karasawa 1968	Trial compared norethindrone/mestranol combination with placebo, however combination of OCP studied is no longer available. 2mg norethindrone, 0.1mg mestranol. Trial published in Japanese.
Kaunitz 2000	Only small number of women with dysmenorrhoea included in the study.
Kremser 1971	Trial compared Norinyl ‐ norethisterone 2mg and mestranol 0.1mg combination with placebo, this combination of OCP is no longer available.
Kristjansdottir 2000	Not a randomised or controlled clinical trial.
Kwiecien 2003	Only small number of women with dysmenorrhoea included in the study.
La Guardia 2003	The objective of the study was to compare the efficacy and safety of 5 different OCPs and only reported dysmenorrhoea as an adverse event in approximately 25% of patients. (Table 3)
Matthews 1968	Not a randomised controlled trial
Moore 1999	Only small number of women with dysmenorrhoea included in the study.
Reisman 1999	No women clearly with dysmenorrhea in the study
Tallian 1994	Not an RCT. Allocation to treatment groups was retrospective. Trial published in Hungarian, methods and results sections translated by Gabor Kovacs.