title: Validity and reliability--What's it all about?  Part 1. Validity in quantitative studies.
authors.affiliation: Glasgow Caledonian University, Yorkhill, Scotland.
authors.forename: Alison
authors.initials: A
authors.lastname: Twycross
authors.forename: Linda
authors.initials: L
authors.lastname: Shields
mesh_terms: D003625:Data Collection / Q000592:standards*; D006801:Humans; D015399:Nursing Research / Q000592:standards*; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards*