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Table 2 Subjective and objective sleep problems of premature infants

From: Sleep and breathing in premature infants at 6 months post-natal age

Questionnaire Objective sleep measure r P value
CBISQ Criterion of sleep diary 0.757 0.011*
Nocturnal sleep duration Nocturnal sleep duration
Number of night awakenings Nocturnal awake time 0.632 0.002*
Numbers of night awakening 0.580 0.001*
Nocturnal sleep efficiency −0.644 <0.001*
Daytime sleep duration Daytime sleep duration 0.630 0.002*
Loud-noisy breathing Daytime sleep duration 0.348 0.064+
CBISQ Actigraphy criterion   
Time spent with mouth breathing Awakening time during sleep 0.514 0.042*
Nocturnal sleep efficiency −0.255 0.013*
CBISQ PSG criteria  
Nocturnal sleep duration Nocturnal sleep duration 0.545 0.002*
Number of night awakenings Desaturation index 0.636 0.003*
Daytime sleep duration AHI in sleep 0.767 0.075+
Awakening after sleep onset 0.350 0.080+
Time spent with mouth breathing Obstructive apnea count 0.509 0.026*
Loud-noisy breathing Arousal count 0.401 0.089+
Obstructive apnea count 0.535 0.018*
  1. *P value < 0.05. +P value < 0.10.
  2. AHI: Apnea-Hypopnea Index (events/hour); Desaturation index: desaturation events/hour; “Arousal count” means total number of arousal during sleep; “Obstructive apnea count” means total number of obstructive apnea during sleep.