3.2. Study selection and inclusion criteria
Published and unpublished systematic reviews, rando-mised controlled trials and comparative studies in any language that compared 2 techniques and devices to secure nasogastric tube in patients 18 years old or older were included in this review. We included studies describing all types of techniques and devices used to secure nasogastric tubes. We excluded case reports, editorials, letters, expert opinions, comments and studies referring only to a paediatric population because the securing techniques and devices are different for this group of patients.