The inter-rater reliability and internal consistency of the
SANS were reported to be high (Andreasen, 1984). It was
shown that the total subscale score and composite score for
all items have a higher reliability than the individual items.
The reliability coefficients obtained for different subscales
are more than moderate and fairly satisfactory, averaging
around .77. Mean reliability coefficients assessed separately
for the negative and positive symptoms subscales were computed
to be .78 and .77, respectively. These coefficients are
comparable with those reported by other studies in this area.