Table 4. Item bias across person factors.

Person factors	SAQ-INA Items with uniform DIF
Age groups a	Perception of ward management	24 (ward)
	Working condition	29 and 31
Level of experience b	Safety climate	9 and 13
	Job satisfaction	18
	Working condition	29
Ward class c	Safety climate	7
Hospital type d	Teamwork climate	2
	Perception of hospital management	24, 25 and 26 (hospital)
	Working condition	29, 31 and 32

SAQ-INA: Safety Attitudes Questionnaire–Indonesian version; DIF: Differential item functioning

^a ≤30 years and >30 years old

^b ≤ 5 years and >5 years experience

^c lower class, upper class and no class

^d public hospital and private hospital.