"ID","levelNo","name"
"-1","0",""
"1","0","0 - no recession"
"2","1","1 - recession of alveolar margin only"
"3","2","2 - alveolus widened out, pitted margins, more recession"
"4","3","3 - ante-mortem tooth loss and alveolous infilling"
"5","4","4 - infilling advance but not complete"
"6","5","5 - new bone formation nearly complete"