Linking guideline to regular feedback to increase appropriate requests for clinical tests: blood gas analysis in intensive care

Several errors unfortunately crept into this quality improvement report by Paolo Merlani and colleagues (15 September, 620-4). They all appeared on page 623. In figure 4 the y axis should be labelled from 40 to 100 [not 3-9]. The text for the last two footnote symbols beneath the table should be reversed. An electronic glitch led to some standard deviation values in parentheses appearing as superscript numbers: in the second paragraph under the heading “Impact of the intervention” the mean (SD) values should be 20 (4), 24 (2), 22 (2). Our apologies to the authors.