Skip to main content
. Author manuscript; available in PMC: 2018 Jul 9.
Published in final edited form as: J Trauma Stress. 2015 Jan 28;28(1):8–16. doi: 10.1002/jts.21982

Table 2.

Mean Comparisons by Diagnostic Group Using Kruskal Wallis and Mann-Whitney U Tests

Variable PTSD (n = 45)
 PI (n = 25)
 Control (n = 27)
 PTSD vs. PI
 PTSD vs. Control
 PI vs. Control
M SD M SD M SD U r U R U r
sTSTa 338.85 87.57 351.10 43.83 475.56 37.89 423.0 .13 101.0* .69 4.0* .85
sSLa 50.29 47.47 44.17 26.65 12.35 6.93 462.5 .06 128.5* .64 48.0* .74
sWASOa 73.69 54.58 50.06 36.96 7.03 6.98 367.0 .22 34.5* .79 47.0* .74
sSEa 73.98 14.57 79.26 9.25 95.76 2.29 400.0 .17 32.0* .79 13.0* .82
oTIBb 513.63 85.13 474.39 62.73 505.05 27.96 244.0 .21 338.0 .03 198.0 .27
oTSTb 369.85 77.33 390.29 50.93 435.44 36.73 247.5 .20 167.0* .45 139.5* .45
oWASOb 50.43 22.14 54.10 18.32 41.48 13.48 253.5 .16 250.5 .22 175.0 .34
oSEb 72.49 10.29 82.48 5.22 86.21 4.60 120.0* .54 73.0* .68 166.0* .36
ISIc 18.73 4.36 16.76 3.03 0.57 0.76 389.5 .25 0.0* .73 0.0* .83
PSQI 14.11 3.21 11.36 2.20 2.19 1.36 272.0* .43 0.0* .84 0.0* .86

Note. PTSD = posttraumatic stress disorder; PI = primary insomnia; sTST = subjective total sleep time; sSL = subjective sleep latency; sWASO = subjective wake after sleep onset; sSE = subjective sleep efficiency; oTIB = objective time in bed, oTST = objective total sleep time, oWASO = objective wake after sleep onset; oSE = objective sleep efficiency; ISI = Insomnia Severity Index; PSQI = Pittsburgh Sleep Quality Index.

a

For the subjective variables, n = 40 for PTSD, n = 27 for control and n = 25 for PI.

b

For the objective variables, n = 25 for PTSD and control and n = 21 for PI.

c

For the ISI, n = 45 for PTSD, n = 25 for PI, and n = 14 for controls.

*

p < Bonferroni-corrected alpha .05/3 = .017.