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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