Table 6.

Scale construction of EORTC QLQ-C30 items internal consistency comparison

Data	Sample (n)	PF	RF	CF	EF	SF	QL	FS	PS	NVS
Our study	120 (CRC)	0.79	0.82	0.80	0.80	0.83	0,82	0,78	0.79	0.83
Moroccan (Nejjari)	125 (HC)	0.84	0.94	0.34	0.89	0.80	0.87	0.83	0.78	0.74
Lebanese	200 (HC)	0.89	0.80	0.60	0.79	0.65	0.89	0.81	0.75	0.43
United Arab Emirates	87 (BC)	0.76	0.84	0.67	0.87	0.79	0.86	0.84	0.50	0.86
Malysian chinese	96 (CRC)	0.74	0.92	0.26(	0.79	0.71	0.91	0.79	0.77	0.82
American	489 (NCP)	0.77	0.88	0.58	0.84	0.80	0.84	0.81	0.83	0.50
Turkish	194 (LC)	0.70	0.89	0.71	0.84	0.76	0.94	0.94	0.87	0.76
German	1864 (HC)	0.57	0.36	0.85	0.72	0.78	0.90	0.86	0.89	0.75
Ethiopian Amharic	153 (GC)	0.83	–	0.29	0.93	0.82	0.92	0.89	0.73	0.75
Brazilian portugese	986 (LC)	0.80	0.79	0.57	0.84	0.69	0.78	0.78	0.81	0.68
Iranian	132 (BC)	0.76	0.77	0.77	0.77	0.73	0.82	0.65	0.66	0.69
indonesian	128 (HC)	0.82	0.79	0.82	0.78	0.83	0.80	0.72	0.85	0.70
korean	170 (NC)	0.87	0.87	0.60	0.86	0.82	0.84	0.78	0.84	0.85
Spanish mexican	150 (GRC)	0.79	0.8	0.32	0.85	0.8	0.9	0.78	0.55	0.8
Taiwan chinese	99 (LC)	0.85	0.92	0.58	0.81	0.82	0.86	0.80	0.81	0.74
Thailand	(NC)	0.75	0.76	0.50	0.86	0.63	0.90	0.73	0.80	0.82

CRC (colorectal cancer), HC (heterogenous cancers), BC (breast cancer), NCP (non cancerous population), LC (lung cancer), GC (gynecological cancer),GRC (gastric cancer)