Use:
Displays descriptive statistical information for each question. The statistics are displayed in groups, allowing you to show or hide the groups you need.
Description:
The Item Statistics report displays each question and the following statistics: sample size, number missing, mean, variance, standard deviation, standard error, minimum, maximum, range, skewness, kurtosis, t-value, mean absolute deviation, 25th and 75th percentiles, median, interquartile range, and 1%, 5%, 95% and 99% confidence intervals.