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Associations among autonomic reactivity measures at 32 weeks postconceptional age. Symbols at r = 0.3 or greater are significant at p <0.05. HR, change in heart rate from baseline to squeeze; LFP, change in low-frequency power from baseline to squeeze; HFP, change in high-frequency power from baseline to squeeze; LFP/HFP, ratio of LFP to HFP at squeeze.
