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Correspondence response
Response to ‘Infrapatellar fat pad maximal area and changes in knee symptoms: gender-related difference or gender difference in reporting?’ by Bai et al
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  1. Faming Pan1,2,3,
  2. Weiyu Han1,4,
  3. Xia Wang1,
  4. Zhenhua Liu1,4,
  5. Xingzhong Jin1,
  6. Benny Antony1,
  7. Flavia Cicuttini5,
  8. Graeme Jones1,
  9. Changhai Ding1,3,5
  1. 1Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
  2. 2Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, China
  3. 3Arthritis Research Institute, 1st Affiliated Hospital, Anhui Medical University, Hefei, Anhui, China
  4. 4Department of Orthopedics, 3rd Affiliated Hospital of Southern Medical University, Guangzhou, China
  5. 5Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Victoria, Australia
  1. Correspondence to Professor Changhai Ding, Menzies Institute for Medical Research, University of Tasmania, Private Bag 23, Hobart, Tasmania 7000, Australia; Changhai.Ding{at}utas.edu.au

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We would like to thank Bai et al for their interest in and comments on our paper titled ‘A longitudinal study of the association between infrapatellar fat pad maximal area and changes in knee symptoms and structure in older adults’.1

First, we agree that the overall response rate was not high (57%). We identified the participants randomly from the local community using the electoral roll, and the reasons for not participating in this study were not being eligible, not being contactable and refusing to participate. The response rate is comparable to those (52–58%) from studies with equivalent response burdens conducted around the same time period.2 ,3 The moderate response rate can be offset by the high rate of retention at follow-up. Bai et al assumed that people with pain to start with were more likely to respond, and those with significant changes in pain symptoms over …

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