Table 2

Results of Rasch analyses
Analysis Overall model fit Item fit residual mean (SD) Person fit residual mean (SD) % significant t-tests Coefficient Alpha (Grading) Person locations
SIQTR-5
Initial fit χ2 = 6.639 (d f= 5), p = .249 -0.786 (0.922) -0.136 (0.548) na 0.705 M = -1.238
Moderate SD = 1.131
Final fit χ2 = 7.320 (d f= 6), p = .292 -0.503 (0.928) -0.069 (0.583) na na M = -1.324
SD = 1.161
SITBI-11
Initial fit χ2 = 52.463 (d f= 22), p = .0003 -0.271 (1.384) -0.186 (0.649) 0.42% 0.716 M = -1.662
Fair SD = 1.295
Final fit χ2 = 46.978 (d f= 26), p = .007 -0.254 (1.162) -0.202 (0.649) na na M = -1.629
SD = 1.325
DSHI-16
Initial fit χ2 = 33.957 (d f= 32), p = .373 -0.278 (1.165) -0.185 (0.351) 1.69% 0.783 M = -3.117
Fair SD = 1.159
Final fit χ2 = 30.790 (d f= 24), p = .160 -0.127(1.209) -0.254 (0.560) na na M = -2.495
SD = 1.136
ISAS-12
Initial fit χ2 = 38.299 (d f= 24), p = .032 -0.278 (0.962) -0.123 (0.713) 1.81% 0.826 M = -1.872
Fair SD = 1.358
Final fit χ2 = 23.441 (d f= 18), p = .174 -0.171 (0.883) -0.164 (0.700) na na M = -1.802
SD = 1.185
SHIF-16
Initial fit χ2 = 150.982 (d f= 64), p = .000 -0.731(1.951) -0.210 (0.454) 1.6% 0.794 M = -2.484
Fair SD = 1.195
Final fit χ2 = 70.304 (d f= 46), p = .012 -0.708 (1.174) -0.290 (0.676) na na M = -1.828
SD = 1.012
SHI-22
Initial fit χ2 = 289.355 (d f= 154), p = .000 -0.537 (1.740) -0.179 (0.712) 5.50% (3.7-7.3) 0.814 M = -2.051
Fair SD = 1.280
Final fit χ2 = 201.992 (df =153), p = .005 -0.460 (1.220) -0.215 (0.764) na na M = -1.944
SD = 1.201
Ideal Values Probabilities greater than Bonferroni adjusted p values (i.e., 0.05 divided by the number of significance tests) Mean = 0.0 Mean = 0.0 Less than 5% Fair or bettera M = 0.0
(SD = 1.0) (SD = 1.0)

aGradings based on Ponterotto & Ruckdeschel [58] and take into account number of items and sample sizes.

Latimer et al.

Latimer et al. BMC Psychiatry 2013 13:4   doi:10.1186/1471-244X-13-4

Open Data