Table 2.

Study details: patient variables.

Study		Patient variables
		Age	Sex	Demographics	Symptoms	Comorbidities	Lifestyle	Examination	FBCa	Other blood tests	Otherb
Development studies
	Alzubi et al, 2019 [39]	Xc	—d	—	X	X	X	—	—	—	X
	Chang et al, 2009 [40]	X	X	—	X	X	X	—	X	X	—
	Cooper et al, 2018 [41]	X	X	X	—	—	—	—	—	—	X
	Cowley et al, 2013 [42]	—	—	—	X	X	X	—	—	—	X
	Daqqa et al, 2017 [43]	—	—	—	—	—	—	—	X	—	—
	Goryński et al, 2014 [44]	X	X	X	X	X	X	X	X	X	X
	Hart et al, 2018 [45]	X	X	X	—	X	X	X	—	—	—
	Kalra et al, 2003 [46]	X	—	X	X	X	—	X	—	X	—
	Kang et al, 2017 [47]	X	X	—	—	—	—	X	X	X	X
	Kinar et al, 2016 [48]	X	X	—	—	—	—	—	X	—	—
	Kop et al, 2016 [49]	X	X	—	X	X	X	X	X	X	X
	Miotto et al, 2016 [50]	—	—	X	X	X	X	X	—	X	X
	Payandeh et al, 2009 [51]	—	—	—	—	—	—	—	X	—	—
Validation studies
	Birks et al, 2017 [52]	X	X	—	—	—	—	—	X	—	—
	Hornbrook et al, 2017 [34]	X	X	—	—	—	—	—	X	—	—
	Kinar et al, 2017 [53]	X	X	—	—	—	—	—	X	—	—

^aFBC: full blood count.

^bMore detail on other variables included is available in Multimedia Appendix 4.

^cX: corresponding variable used in this study.

^dNot used in this study.