Variable Details

Available Studies

ROS, MAP, MARS, Clinical Core, LATC

Scaled? 

Scaled

Variable Type 

Longitudinal

Variable Name 

cogn_ps

Categories

Cognition

Perceptual speed
Perceptual speed domain - Average of 4 tests

We formed a composite measure of the cognitive domain perceptual speed by converting raw scores on each cognitive test to z scores, using the mean and standard deviation of the cohort, and then averaging the z scores to yield the composite.

The following 4 cognitive tests are used to compute this score:

test score z-score cognitive test
cts_sdmt z_SDMT symbol digits modality test (oral)
cts_nccrtd z_NCcrtd number comparison
cts_stroop_cname z_cname stroop color naming
cts_stroop_wread z_wread stroop word reading

Item level variables are available upon request.

Note: The variable is calculated if more than half the z-scores are non-missing.


Publications