The health and social care regulator the Care Quality Commission published its State of Care report today.
The results of the survey, conducted last year, show nearly a quarter of nursing homes didn't have enough staff to meet the complex needs of patients.
"Where we did find poor quality care there were three common factors," CQC chief executive David Behan told the Today programme.
"Where services had higher vacancy rates or staff were poorly deployed, or indeed if there was a wrong skill mix available to provide that care, that could then create a situation where staff focussed on task rather than individual."
Mandy Thorn, vice-chair of the National Care Association, believes the biggest factor "is about the money".
"Sadly what we're seeing is more and more people commissioning services on the basis of cost," she warned.
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