TABLE 4.

Item generation and reduction – PROM development

	BCL E-SEI	FL QA-I	FL QA-LS	LL IS	LL IS 2.0	LSI DS-A	LSI DS H&N	LS IDS-L	Lym-ph-ICF	Lym-ph-ICF-UL	Lym-ph-ICF-LL	LYM-QOL	Ly-QLI	PBI-L	(S)LQ-OLI	UL-L-27	ULL-QoL
Item generation
Patient interviews																X
Patient survey		X					X		X		X			X			X
Expert opinions						X	X	X							Xa
Literature review						X	X		X		X						X
Based on other PROM		X	X		X		X	X		X			Xa		Xa
Author’s experience				Xa	X
Item reduction
Endorsement frequency						X
Item redundancy			X			X						Xa					X
Expert opinion		X	X										Xa	X			X
Missing data
Factor analysis			Xb										Xa			X

PROM patient-reported outcome measure

^aLimited information on development

^bFactor analysis was not conclusive