Study to Translate and Determine the Validity and Reliability of Malay Version of painDETECT Questionnaire (PDQ-M)

The translation and cultural adaptation process of the English version of PDQ will be performed based on international guidelines. Subsequently, patients with neuropathic and nociceptive pain based on clinician's diagnoses will be recruited to complete three-type numeric rating scale (NRS) of pain followed by PDQ-M and SF-36 questionnaire. Patients' socio-demographic data and clinical characteristics will be reported using frequency for categorical variables and mean with standard deviation for continuous variables. Normality will be assessed using Shapiro Wilk test and histograms for continuous variables. Data will be compared between groups using chi-square test (for categorical variables) and t-test or Mann-Whitney's U test (for continuous variables). Suitability of PDQ-M data for factor analysis will be verified using the Bartlett's test of sphericity and the Kaiser-Mayer-Olkin (KMO) measure of sampling adequacy. Parallel analysis will performed to obtain the suitable factors. Construct validity will be investigated by exploratory factorial analysis (EFA) with varimax rotation. A factor loading of >0.40 will be used to determine the items for each factor. The internal consistency of the questionnaire will be assessed using Cronbach's alpha test. A p value of <0.05 is taken as statistically significant.