From: Changes in the symptom frequency of rapid eye movement sleep behavior disorder according to disease duration
Symptom frequency (NAR)
Duration (years)
n
Median
Interquartile range
p
0–2
12
18
2–29
Reference
2–4
8
75
50–158
0.006
4–6
13
50
36–150
0.016
6–8
4
175
125–241
0.003
>8
12–100
0.280
All
24–115