TABLE 2.

Individual scale properties of the PREM‐OB Scale™ Suite

Scale	Number of items	Cronbach alpha	Raw score				IRT scaled scores
			Mean	SD	Min	Max	Mean	SD	Min	Max
Racism	12	0.93	21.9	10.3	12	60	0	0.92	−1.37	3.06
Kinship	9	0.86	23.4	8.1	9	45	0	0.92	−2.15	2.71
Humanity	31	0.96	74.2	27.4	31	155	0	0.94	−2.52	3.24

Abbreviations: IRT, item response theory; Max, maximum; Min, minimum; SD, standard deviation.