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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: Am J Geriatr Psychiatry. 2018 Jan 31;26(6):700–710. doi: 10.1016/j.jagp.2018.01.005

Table 3.

Comparison of self-reported on/off symptom data and UPDRS-IV interview responses (n=223)

UPDRS-IV Group Self-reported on/off symptoms No self-reported on/off symptoms Total τ p
Any “off” periods 83 19 102 0.78 < 0.001
No “off” periods 6 115 121
 Total 89 134 223

Participants scoring >1 on any of questions 36–39 of the UPDRS-IV (fluctuation items) were considered as having any “off” periods. τ = Kendall’s rank correlation (Kendall’s tau coefficient) between UPDRS-IV measures and self-report responses.