Dr Weimers and colleagues have drawn attention1 to the possibility that our recently published observation of an association between IBD and Parkinson's disease (PD) in a nationwide Danish cohort study2 may reflect surveillance bias.
In a recently published Swedish cohort study, Dr Weimers and colleagues found that adjusting for number of healthcare visits during follow-up of patients with IBD attenuated the risk of developing PD markedly.3 They also found that the risk of future PD was proportional to the number of healthcare visits (<10 (reference) 10 -<20, 20 -<50, ≥50) during follow-up (up to 12 years).3
We had a number of methodological reasons for not adjusting for number of healthcare visits. For example, the Danish National Patient Register does not only record encounters with a physician but also with midwifes and nurses and encounters with relation to rehabilitation. We assume that these kinds of visits are less...
https://ift.tt/2PPUgZ0
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