LSNS-18, LSNS-6, LSNS-R
In the meantime we suggest you examine the following article which addresses clinical cut off points and scoring of the LSNS-6:
Lubben, J., Blozik, E., Gillmann, G., Iliffe, S., von Rentein Kruse, W., Beck, J.C., & Stuck, A.E. (2006). Performance of an abbreviated version of the Lubben Social Network Scare among three European community-dwelling older adult populations. The Gerontologist, 46(4), 503–513.