Abbreviations: PS: Patients admitted to BTC Servette in 2006, once or several times (n=323, 65%); BTC_once: Patients admitted only once in BTC in 2006 (n=163,
33%); BTC_repeat : Patients admitted several times in BTC (n=160, 32%); NT: Patients whose treatment failed (n=44, 9%); NS: Patients admitted for night support
only (n=126, 26)