After the publication of this article [1] it was noticed by the author that the article contained a couple of errors. On page three, under the sub-heading ‘Standardized form for data extraction’ it is stated that the form contained 6 nursing outcomes, whereas this should read as 5 nursing outcomes. Also, on page four, under the sub-heading ‘Data analysis’ there are two mistakes which refer to interclass. However, this should read as intraclass.