The SRE-T score was derived from a self-report instrument administered to a smaller subset of COGA participants (N=4,296) and assesses the participant’s response to 4 items that address the number of drinks required for the participant to feel the effects of alcohol, feel dizzy or begin to slur in speech, to stumble, or to fall asleep. Scores across three time points (first five times the participant used alcohol, last three months and period of heaviest drinking) are averaged to create the total (SRE-T) score (Schuckit et al., 1997), winsorized at ± 2 standard deviations from the mean, and further transformed using the square root of the value to correct for skew.
