Table 1.

Patient details and variables

Variable	Type of variable	Primary [P]/secondary [S]	Description	Units of measurement [P present, A absent]
Age	Demographic characteristic	P	Age of each patient	Years
Parity	Demographic characteristic	P	No of deliveries	Number
Gestation	Demographic characteristic	P	Number of weeks of pregnancy	Weeks
Pain	Clinical characteristic	P	Presenting with abdominal pain	P/A
Vomiting	Clinical characteristic	P	In association with the other symptoms	P/A
Bleeding	Clinical characteristic	P	Vaginal bleeding	P/A
Diarrhoea	Clinical characteristic	P	In association with the other symptoms	P/A
Shoulder tip pain	Clinical characteristic	P	in association with the other symptoms	P/A
Syncope	Clinical characteristic	P	In association with the other symptoms	P/A
Smoking	Risk factor	P	Known long term smoking	P/A
Previous tubal surgery	Risk factor	P	Due to previous tubal pathology	P/A
Previous pelvic surgery	Risk factor	P	Due to previous pelvic pathology	P/A
Previous miscarriage	Risk factor	P	Diagnosed as miscarriage by scan and histopathology	P/A
Previous termination of pregnancy	Risk factor	P	Diagnosed as intra uterine pregnancy by scan and histopathology	P/A
Assisted reproduction	Risk factor	P	Previous pathology	P/A
Previous infertility	Risk factor	P	Previous pathology	P/A
Pelvic inflammatory disease	Risk factor	P	Previous pathology	P/A
Use of intrauterine contraceptive device	Risk factor	P	As contraceptive	P/A
Initial beta HCG level	Investigation	S	Blood test	mIU/ml
Transvaginal/trans-abdominal scan	Investigation	S	Ultrasound scan	Performed/not performed
Adnexal mass	Investigation	S	Scan finding	P/A
Gestational sac	Investigation	S	Scan finding	P/A
Fetal heartbeat	Investigation	S	Scan finding	P/A
Fluid in Pouch of Douglas	Investigation	S	Scan finding	P/A
Empty uterus	Investigation	S	Scan finding	P/A
Hemoperitoneum	Investigation	S	Scan findings	P/A
Laparotomy	Treatment	S	Intra operative findings	P/A
Tubal ectopic pregnancy	Treatment	S	Intra operative findings	P/A
Salpingectomy	Treatment	S	Intra operative findings	P/A
Salpingotomy	Treatment	S	Intra operative findings	P/A
Hemoperitoneum	Treatment	S	Intra operative findings	P/A
Presence of hepatic adhesions	Treatment	S	Intra operative findings	P/A
Contralateral pathology	Treatment	S	Intra operative findings	P/A