Table 4.

Logistic regression analysis results.

	PTSD yes: n = 57, no: n = 60		PTNM yes: n = 26, no: n = 91		NTNM yes: n = 20, no: n = 97
	OR [95% CI]	p	OR [95% CI]	p	OR [95% CI]	p
HRR	2.13 [1.18, 3.88]	.013*	1.97 [1.04, 3.74]	.038*	0.86 [0.43, 1.68]	.661
SCR	0.58 [0.28, 1.18]	.134	0.69 [0.29, 1.64]	.399	2.07 [0.87, 4.92]	.098
PTNM freq.	1.70 [1.18, 2.45]	.005**
NTNM freq.	1.25 [0.91, 1.71]	.171

Note. The groups shown in this table represent alternate ways of dichotomizing the total sample and the PTSD and nightmare groups are not mutually exclusive. Participants who reported both frequent posttraumatic and nontraumatic nightmares were assigned to the more severe PTNM group. PTNM = at least one posttraumatic nightmare / week, NTNM = at least one nontraumatic nightmare / week, PTNM freq. = posttraumatic nightmare frequency, NTNM freq. = nontraumatic nightmare frequency, OR = odds ratios, CI = confidence intervals, HRR = heart rate mean response, SCR = skin conductance mean response.

^*= p < .05

^**= p < .01.