Table 1.

Components of the neuropsychiatric battery in the Dialysis and Cognition Study

Function Assessed	Cognitive Test	Scoring	Test Details
Cognitive Screen	Mini-Mental State Exam	Number Correct	30-point questionnaire that samples abilities such as arithmetic, memory, and orientation.
Intelligence	North American Adult Reading Test	128.7 - (0.89 × # of pronunciation errors)	Estimation of verbal intelligence quotient that requires subjects to read a list of 61 words out loud.
Supraspan Learning & Word Recall			Subjects attempt to memorize a list of 12 words read out loud over 4 trials. After a delay of 25 to 35 minutes, percent retention is the percentage of words correctly recalled compared to immediate recall and delayed recognition is the number of words correctly identified as familiar or non-familiar from a list of 24.
	Immediate Recall*	Total initially correct
	Percent Retention*	Percent recall after delay
	Delayed Recognition*	Number of correctly identified words
Visual Construction & Fluid Reasoning	Block Design^	Number completed weighted for time	Subjects are required to reproduce depicted patterns using a set of colored blocks.
Attention, Mental Processing Speed, & Executive Function
	Digit Symbol-Coding^	Number of copied symbols in 2 minutes	Symbols are decoded by matching a given symbol to a digit provided in an answer key
	Trail Making Test A	Time to Completion	“Connect-the-dots” for a consecutive number sequence from 1 to 25.
	Trail Making Test B	Time to Completion	“Connect-the-dots” alternating between numbers (1 to 13) and letters (A to L) (ex: 1-A-2-B-3-C).

^*Derived from the Word List Learning subtest of the Wechsler Memory Scale - III (WMS-III)

^{^}From the Weschler adult intelligence scale III.