Study	Reason for exclusion
Griffith 1998	The method of randomisation was unclear. Not an intervention for leg cramps, the participants included pregnant women without leg cramps.
Kohama 2006	This is not a randomised controlled trial, and included women with other types of pain (including lower back pain, hip joint pain and pelvic pain) in addition to leg cramps.
Mauss 1970	Cross‐over study, not a randomised controlled trial.
Mukherjee 1997	Quasi‐randomised controlled trial (alternate allocation).
Odendaal 1974	Some women received more than 1 course of treatment, not necessarily the same treatment.
Robinson 1947	Quasi‐randomised controlled trial (alternate allocation).
Rougin 2012	The participants were not pregnant women.
Shahraki 2006	Quasi‐randomised controlled trial (alternate allocation Quote: "The total number of samples was 120 persons, whose divided into 3 groups and each group was included 40 persons which were divided randomly and turn of coming" p980).
Thauvin 1992	Not an intervention for leg cramps. The participants included pregnant women without leg cramps.