Questions, answers, and metadata collected from 53,981 Hypersensitive Narcissism Scales. The data was hosted on OpenPsychometrics.org a nonprofit effort to educate the public about psychology and to collect data for psychological research. Their notes on the data collected in the codebook.txt
From Wikipedia:
The Hypersensitive Narcissism Scale (HSNS) is a self-report measure of covert narcissism. It was developed by Holly M. Hendin and Jonathan M. Cheek in 1997. It consists of ten items rated on a five point scale.
It has a near zero correlation with the Narcissistic Personality Inventory, which measures overt narcissism.
The unidimensionality of the HSNS has been questioned.