Pyschiatric wards #usa

Jackie Wasserstein

My paternal grandmother died in Manhattan State Hospital on Wards Island.  The death certificate states that she was on Ward O.B. 1 (I?).  Does anybody know what O.B. means?v  I'm just looking for clues as to the reason she was admitted to Manhattan State Hospital.
Jackie Wasserstein
East Meadow, New York

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