Study	Reason for exclusion
Andolsek 1977	Pain related to the abortion was not reported.
Bonazzi 1987	Unclear range of gestational age (mean 9.8 with SD of 1.6), unclear if vacuum curettage. The author could not be successsfully contacted.
Bonazzi 1994	Unclear range of gestational age (mean 9.8 with SD of 1.4), unclear if vacuum curettage. The author could not be successsfully contacted.
Cade 1993	Randomization by hospital medical records number does not qualify as randomization. Unclear if procedure was suction curettage versus sharp D&C
Ciri 1986	Pain related to the abortion was not reported.
Coad 1986	Pain is not measured with the procedure, but only as side effect of the anesthesia administration
Corli 1984	Amount of pain is measured in a dichotomous fashion only with clamping of the cervix and at what amount of cervical dilation; not with the procedure itself. The range of the gestational age is unclear, however, given that vacuum curettage was performed we assume it was first trimester. The author could not successfully be contacted to clarify questions.
Crawford 1984	Pain is not an outcome measured
Edelist 1987	Pain with or after the procedure is not measured, but only pain as side effect of the anesthesia administration (meantioned in the discussion). Unclear if vacuum or sharp curettage. Author could not successfully be contacted to clarify questions.
Enlund 1996	Outcome of number of days of sick leave depending on anesthetic used leads to follow up of several days, which is beyond the scope of our review.
Eriksson 1995	Pain with or after the procedure is not measured, but only pain as side effect of the anesthesia administration and postoperative analgesia requirements. Unclear if vacuum or sharp curettage
Erkola 1990	The outcome studied is the treatment of anesthesia side effects. Unclear if the procedure was a dilation and curettage or a vacuum aspiration.
Hamar 1989	Pain related to the abortion was not reported.
Jakobbson 1990	Randomization by date of birth.
Kallela 1994	Pain related to the abortion was not reported. Only assessed need for postoperative analgesics and pain with injection of anesthetic. Author could not successfully be contacted to clarify questions.
Lichtenberg 2003	Pain related to the abortion was not reported.
Lowenstein 2006	Randomization by day of treatment.
Matambo 1999	only letter to editor.
Miller 1996	Not adequately allocated
Nielsen 1975	Not adequately randomized
Parkash 1979	Not randomized.
Peters 1978	Unclear if randomized. Author could not successfully be contacted.
Rawling 2001	Gestational age up to 14.5 weeks.
Sanders 1984	Pain related to the abortion was not reported.
Schoeffler 1987	Pain related to the abortion was not reported.
Verma 1985	Pain related to the abortion was not reported.
West 1985	Pain related to the abortion was not reported.
Wiebe 2005	Gestational age up to 16 weeks as per e‐mail clarification with the author.
Willdeck‐Lund 1975	Not randomized. Tried to contact the author, but he passed away.