308.1 General : All structures in which people suffering from physical limitations because of health or age are harbored for medical or other care or treatment, or in which people are detained for penal or correction purposes, or in which the liberty of the inmates is restricted, shall be classified as Use Group I-1, I-2 or I-3. the term ???Use Group 1??? shall include Use Groups I-1, I-2 and I-3.