大佬们救救我，有一个只有两道题的量表，如何检验效度啊，信度可以但KMO一直0.5。?

Job satisfaction was measured by a 10-point additive scale based on two items (Schneider, Hanges, Brent Smith, & Salvaggio, 2003): Considering everything, how satisfied are you with your job? Considering everything, how would you rate your overall satisfaction with your company at the present time? The correlation between the items is equal to 0.8, and the measure is reliable(Spearman Brown coefficient = 0.89).