Development of Cardiovascular Indices of Acute Pain Responding in Infants: A Systematic Review

Table 5

Mean and standard deviations for low frequency heart rate variability in response to acute pain at less than 7 postnatal days.

Gestational age	Reference	Mean LF HRV	SD
28–32 weeks	Cong et al. [39]	17.62	24.55
37–42 weeks	Gormally et al. [43]	1.65	N/A
	Lindh et al. [55]	4.2	0.4
	Lindh et al. [54]	4.00	0.39
	Oberlander et al. [57]	11.0	N/A
	Weissman et al. [71]	1.45	0.38

Note. HRV = heart rate variability, LF = low frequency, SD = standard deviation, and denotes numbers that were extrapolated from graphs.