Table 2.

Results of Spearman correlation analyses.

	HRR	SCR	EMGR	PTNM	NTNM	RMSSD	HF power
SCR	0.42***
EMGR	0.37***	0.29**
PTNM	0.20*	0.05	0.11
NTNM	0.13	0.19*	0.07	−0.03
RMSSD	0.10	0.00	−0.06	−0.01	−0.01
HF power	0.16	−0.02	−0.03	−0.01	0.01	0.94***
PCL-5	0.20*	−0.03	0.01	0.41***	0.00	−0.08	−0.11

Note. Table shows correlation coefficients (Spearman’s rho). PTNM = frequency of posttraumatic nightmares (weighted by number of diary nights), NTNM = frequency of nontraumatic nightmares (weighted by number of diary nights), HRR = heart rate mean response, SCR = skin conductance mean response, EMGR = electromyogram mean response (left orbicularis oculi), RMSSD = Root mean square of the successive differences (resting heart rate variability), HF power = log-transformed high frequency power (resting heart rate variability), PCL-5 = PTSD Checklist for DSM-5 (without item 2)

^*= p < .05

^**= p < .01

^***< .001.