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Table 10 Kendall’s tau (τ) correlations between IPQ-O sub-scales and other continuous scales to assess construct validity

From: Testing the psychometric properties of the illness perceptions questionnaire for OCD (IPQ-O)

IPQ-O sub-scale   OCD severity (Y-BOCS total) OCD severity (Y-BOCS obsession total) OCD severity (Y-BOCS compulsion total) Depression (PHQ-9 total) Anxiety (GAD total) Attitudes towards seeking mental health services – Openness (IASMHS) Attitudes towards seeking mental health services - Help seeking propensity (IASMHS) Attitudes towards seeking mental health services - Indifference stigma (IASMHS) Functioning (WSASa)
1 Identity τ .15** .18** .11* .15** .22** .08 −.02 0 .110
N 234 237 237 230 228 224 226 224 110
2.Consequences τ .45** .43** .41** .39** .39** −.09* −.18** −.27** .47**
N 292 296 294 280 278 272 277 275 137
3.Control τ −.38** −.32** −.37** −.29** −.24** .08 .32** .17** −.26**
N 289 293 291 277 276 272 274 272 139
4.Permanence τ .23** .18** .24** .21** .24** −.02 −.12** −.13** .09
N 300 304 303 288 288 280 285 283 140
5.Coherence τ −.16** −.13** −.15** −.15** −.12** .18** .08 .24** −.11
N 302 305 305 288 289 282 287 284 140
6.Reactivity τ −.03 −.01 −.05 .07 .11* .00 .04 −.04 .07
N 294 298 297 283 283 275 280 279 141
7.Spectrum τ −.13** −.12** −.13** −.14** −.13** −.06 .16** .01 −.16**
N 307 311 310 294 295 287 291 289 145
8.Emotional representation τ .37** .38** .33** .29** .38** −.07 −.08 −.20** .29**
N 301 305 303 288 288 282 288 284 142
9.Environmental stress attributions τ .09* .12** .07 .13** .13** −.03 .09* −.09* .17**
N 301 305 304 289 288 282 286 284 145
10.Biological attributions τ .05 .05 .04 .06 .07 .02 .05 −.05 .06
N 305 309 308 292 292 285 289 287 145
11.Learned behaviour attributions τ −.07 −.03 −.09* −.03 −.06 .01 .10* −.07 .03
N 308 312 311 295 295 288 292 290 146
12.Own characteristics or behaviour attributions τ .06 .06 .05 .16** .12** −.13** .03 −.08 .03
N 303 307 306 290 290 284 288 286 143
  1. ** P < 0.01 (2-tailed) * P < 0.05 level (2-tailed)
  2. aNs for the WSAS scale are smaller than other measures due to error in how the WSAS scale was displayed to early completers of the online measure. Only participants taking part after the online questionnaire error was corrected are included for this scale