Members of the Massachusetts Nurses Association have ratified new labor contracts with Quincy Medical Center and the UMass Memorial Medical Center in Worcester.

Unionized nurses, who mounted a 24-hour strike at the Quincy hospital April 11 to dramatize their complaints about staffing levels, ratified a one-year agreement with the hospital, union officials said Wednesday. The hospital is owned by Boston-based Steward Health Care System, which operates 11 for-profit hospitals across eastern Massachusetts.

Meanwhile, union leaders said nurses at the Memorial/Hahnemann campus of UMass Medical Center earlier ratified a new three-year contract. Nurses had threatened a strike at that hospital last month, also over staffing levels, but the strike was averted by a tentative agreement.

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