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Table 2 Agreement between manual and computerized detection and analysis of PLM, evaluated with intraclass correlation coefficients

From: Validation of a leg movements count and periodic leg movements analysis in a custom polysomnography system

 

Manual quantification

Computerized quantification

Intraclass correlation coefficient

P values

PLM index

 PLMS/h, TST

16.5 (0.2–194.6)

16.6 (0.2–204.7)

0.999 (0.998–0.999)

<0.001 *

 PLMS/h, NREM sleep

16.9 (0–195)

17.5 (0–205.2)

0.999 (0.998–0.999)

<0.001 *

 PLMS/h, REM sleep

4.4 (0–172.5)

4.4 (0–195)

0.994 (0.989–0.994)

<0.001 *

 PLMW

50.2 (0–128.5)

49 (0–134.8)

0.991 (0.965–0.996)

<0.001 *

PLMS associated with respiratory events/h

0 (0–4.5)

0.1 (0–3.8)

0.977 (0.955–0.988)

<0.001 *

Intermovement interval

 TST, sec

32.8 (17.2–59.8)

34.9 (17.2–61.3)

0.945 (0.886–0.973)

<0.001 *

 NREM sleep, sec

35 (17.4–59.8)

34.5 (17–61.3)

0.878 (0.778–0.875)

<0.001 *

 REM sleep, sec

28.9 (15.5–62.6)

29.1 (16.2–55.2)

0.831 (0.659–0.921)

<0.001 *

 Wakefulness, sec

25.4 (14.7–35.3)

22.9 (16.3–34.7)

0.779 (0.617–0.877)

<0.001 *

Periodicity index

0.8 (0–1)

0.8 (0–1)

0.958 (0.918–0.978)

<0.001 *

  1. PLM periodic leg movements, PLMS periodic leg movements during sleep, PLMW periodic leg movements during wakefulness, TST total sleep time
  2. *Significant p-values after correction for multiple comparisons according to Bonferroni are given in bold letters