The Data Analysis item Screening of patient report outcome measurement scale in idiopathic pulmonary fibrosis

In order to develop the PRO scale for IPF patients with Chinese characteristics, Delphi expert consultation method and IPF patients clinical questionnaire survey method will be used to screen the items of the scale. This data is the relevant data obtained from the expert importance scoring and effective clinical questionnaire. The items collected in the early stage are made into an expert consultation questionnaire, and each expert independently scores the importance of the items in the questionnaire. The critical value is determined by the average value and standard deviation of the three indexes: The average value, Coefficient of variation and unimportant percentage of each item. Deletion criteria include items with average value less than critical value, items with coefficient of variation greater than critical value, and items with unimportant percentage greater than critical value. Items meeting the above two or more deletion criteria will be deleted. The primary scale formed after expert consultation and statistics will be made into a clinical questionnaire and distributed to IPF patients. The questions of each item are mostly expressed in frequency or degree. Using Likert 5-grade scoring method, the choice grade is from light to heavy, and 1-5 points are calculated in turn. The recovered effective questionnaires will be analyzed by six statistical methods: item distribution survey method, discrete trend method, Cronbach coefficient method, correlation coefficient method, factor analysis method and multivariate linear regression analysis method, and items that met three or more deletion criteria in the six screening methods will be intended to be deleted.