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. 2012 Dec 1;35(12):1643–1650. doi: 10.5665/sleep.2236

Figure 3.

Figure 3

Long-range cardiorespiratory synchronization strength (λ) and directional coupling index (d(1,2)) (mean and 95% CI) preceding (pre-event) and following (post-event) sigh-P/sigh-CA of 15 healthy infants at 2 weeks, 3 months and 6 months old. (A)-(B): cardiorespiratory synchronization strength, (C)-(D): direction of coupling. *Significant difference between sigh-P and sigh-CA events of the same age, ‡significant difference of sigh-P/sigh-CA events between 2 weeks and 3 months, •significant difference of sigh-P/sigh-CA events between 2 weeks and 6 months, ^significant difference of sigh-P/sigh-CA events between 3 months and 6 months.