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Table 2 RBD symptom frequencies in every 2-year bin of RBD duration

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 13 50 12–100 0.280
All 50 50 24–115  
  1. NAR: Nights affected by RBD
  2. The median RBD frequencies are calculated within each disease duration group