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. 2015 Jul 9;1:15013. doi: 10.1038/npjparkd.2015.13

Table 1. Characteristics of papers included in the review.

Year of publication
 Range 1987–2015
 
Number of publications per decade
 Until 1990 6
 1991–2000 14
 2001–2010 19
 2011–2015 55
Number of DNPD patients per publication
 Range 8–428
 Mean (s.d.) 83.8 (96.0)
 Median 45
Number of publications studying…
 Holistic profile 13
 Autonomic domain 19
 Neuropsychiatric domain 30
 Sensory domain 7
 Fatigue domain 3
 Gastrointestinal domain 6
 Sleep domain 16

Abbreviation: DNPD, drug-naive Parkinson’s disease.