Results suggest that the risk model specified in a prior study is also supported when risk estimation takes into account SIB-free time for male prisoners. The current results extend the prior work by offering further basis for suggesting that there may be reliable factors from domains defined by developmental, mental health/health, offense history, and institutional functioning which discriminate SIB prisoners from non-SIB prisoners. Other analyses suggest major differences in SIB-free time for selected SIB subgroups dependent upon their housing status. Subgroup differences seen with regard to housing instability and whether certain mental health factors were present, lend further support to ongoing legal and clinical concerns about the environmental risks posed to certain prisoners. The finding pertaining to the impact of administrative segregation placement (ADSEG) on prisoners are particularly relevant to the debate going on for the past 10 years concerning the placement of prisoners in maximum security/supermax ADSEG. Data were collected from archival data gathered upon regional administrative approval from the electronic and paper healthcare, and institutional records of prisoners currently serving sentences in the Michigan Department of Corrections. Tables and references