• Deborah Peirce, Janie Brown, Victoria Corkish, Marguerite Lane, and Sally Wilson.
• Princess Margaret Hospital for Children, Child and Adolescent Health Service, Subiaco, WA, Australia.
• J Clin Nurs. 2016 Jun 1; 25 (11-12): 1566-75.

Aims And ObjectivesTo compare two methods of calculating interrater agreement while determining content validity of the Paediatric Pain Knowledge and Attitudes Questionnaire for use with Australian nurses.BackgroundPaediatric pain assessment and management documentation was found to be suboptimal revealing a need to assess paediatric nurses' knowledge and attitude to pain. The Paediatric Pain Knowledge and Attitudes Questionnaire was selected as it had been reported as valid and reliable in the United Kingdom with student nurses. The questionnaire required content validity determination prior to use in the Australian context.DesignA two phase process of expert review.MethodsTen paediatric nurses completed a relevancy rating of all 68 questionnaire items. In phase two, five pain experts reviewed the items of the questionnaire that scored an unacceptable item level content validity. Item and scale level content validity indices and intraclass correlation coefficients were calculated.ResultsIn phase one, 31 items received an item level content validity index <0·78 and the scale level content validity index average was 0·80 which were below levels required for acceptable validity. The intraclass correlation coefficient was 0·47. In phase two, 10 items were amended and four items deleted. The revised questionnaire provided a scale level content validity index average >0·90 and an intraclass correlation coefficient of 0·94 demonstrating excellent agreement between raters therefore acceptable content validity.ConclusionEquivalent outcomes were achieved using the content validity index and the intraclass correlation coefficient.Relevance To Clinical PracticeTo assess content validity the content validity index has the advantage of providing an item level score and is a simple calculation. The intraclass correlation coefficient requires statistical knowledge, or support, and has the advantage of accounting for the possibility of chance agreement.© 2016 John Wiley & Sons Ltd.

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