Hospitals could see further industrial actionpublished at 11:29 British Summer Time 4 October 2018
There could be further strikes at Bridlington, York and Scarborough hospitals, with the Unite union planning a ballot on industrial action.
The hospitals are run by the York Teaching Hospitals NHS Trust, which has transferred all of its porters, catering and maintenance staff to a separate company.
Unite staged a 48-hour strike last week, saying the staff involved would no longer be protected by NHS conditions of service.
The trust previously said "all proper procedures" had been followed.