There is a need to develop a measure that is tailored towards individuals with ASD, and differentiates between symptoms of psychopathology and core ASD symptoms.

Furthermore, it should be modified to capture internalising symptoms that individuals with ASD may find difficult or be unable to verbalise.

However, no cross-validation procedure was performed to elucidate whether validity extension did exist in these four questionnaires for the assessment of perioperative patient satisfaction with GA The current study describes the use of EFA, CFA, and cross-validation techniques to validate a pilot questionnaire developed in a previous study15 to generate a high-quality psychometrically developed and conceptual model estimated questionnaire called the Patient Satisfaction with Perioperative Anesthetic Care questionnaire (PSPACq).

This questionnaire assesses patient satisfaction by focusing on perioperative anesthetic care in Taiwanese patients.

A sample of children and adults with ASD will complete the ACB, in addition to other gold standard measures of concerning behaviour in order to establish the initial psychometric properties of the scale.

Ethics and dissemination This study has received ethical approval from the NHS Research Ethics Committee: London-Camden and King's Cross (ref: 15/LO/0085).

Therefore, the correct data will be determining true the results of research quality.CFA is hypothesis-testing approach that is based on a strong theoretic and/or empiric foundation14 that is used to confirm or reject the postulated model.Meanwhile, CFA can also be used to examine whether the items and the underlying constructs of the model could react the same for different groups, such as men and women or patients receiving general anesthesia (GA) or regional anesthesia (RA).In quantitative research instrument that is often used is in the form of a questionnaire.The questionnaire is a technique of data collection is done by giving a set of questions or a written statement to the respondent to answer.