The data aimed to test the psychometric properties of traditional Chinese Intermittent and Constant Osteoarthritis Pain (ICOAP) questionnaire for Knee Osteoarthritis. The Statistical Package for Social Sciences (SPSS) software (version 21.0) was used to create the dataset. The age was grouped into three bands (1=50-69; 2=60-69; 3=70-78). The abbreviations show as follows: (1). ICOAP= Intermittent and Constant Osteoarthritis and Pain ; (2). v1=first time data collection; (3). v2=second time data collection; (4). SF-12=The Chinese Short form of Health Survey; (5). PCS=Physical Component Summary; (6). MCS=Mental Component Summary
