Table 2.

Psychometric properties of professional identity measures

Measure	Reliability		Validity
	Test-retest	Internal consistency	Content	Structural	Cross-cultural
Clarity of Professional Identity		α = 0.90a [19] α = 0.76a [16]	2 out of 3 supported hypotheses [19]	CFA GFI = 0.94a [16]
Macleod Clark Professional Identity scale		α = 0.79a [1] α = 0.78a [16] α = 0.83a [26]		EFA FA = 0.46–0.73a [1] PCA = 0.50–0.79a [26] CFA GFI = 0.71 [16]
Nurse Self Concept Questionnaire	ρ = 0.73–0.83* [20}	α = 0.90a [20] α = 0.89a [27] α = 0.95a [28]	All items retained [27]	CFA GFI = 0.91a [20] CFI = 0.91a [27] CFI = 0.91a [28] GFI = 0.87a [28]	Chinese [28] Nigerian [27]
Nurses’ Professional Values Scale – Revised	r = 0.76* [21]	α = 0.92a [21] α = 0.94a [16] α = 0.90a [29] α = 0.92a [30] α = 0.93a [31]	100% agreement [21] CVI = 0.90a [29], 0.93a [30]	EFA PCA = 0.46–0.77 [21] PCA = 0.48–0.84a [29] PCA = 0.51–0.76a [31] CFA CFI = 0.89 [21] NFI = 0.87 [21] GFI = 0.74 [16]	Chinese [29] Korean [31] Turkish [30]
Professional Identity Five Factor Scale		H = 0.65–0.85a [22]		CFA CFI = 0.90a [22]
Professional Identity Scale for Nursing Students	r = 0.74* [23]	α = 0.83a [23]	Deemed satisfactory [23]	EFA PCA = 0.48–0.69* [23]
Professional Self Identity Questionnaire		α = 0.93a [24]
The Values Survey		α = 0.64 [25] α = 0.81a [16]		EFA PCA = 0.44–0.84 [25] CFA GFI = 0.89 [16]

EFA Exploratory factor analysis, CFA Confirmatory factor analysis, GFI Goodness of fit, CFI Comparative fit index, CVI Content validity index, NFI Normative fit index, FA Factor analysis, PCA Principal component analysis

^astatistical result at an acceptable or better level, as reported in original publication α Cronbach’s alpha