INS and type 2 diabetes mellitus: 29 items; 5-point Likert scale.Assesses the emotional impact of living with type 2 diabetes. Determines the severity and source of DD. The Sources of DD indicate which aspects of living with type 2 diabetes are creating challenges.The T2-DDAS was validated on people with type 2 diabetes including both insulin and noninsulin users. Adequate reliability for the Core scale was demonstrated by alpha statistics for noninsulin users (α=0.94) and insulin users (α=0.95). The Core Scale has statistically significant construct validity with the 7 Source Scale criterion variables (all, P<.001).