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. Author manuscript; available in PMC: 2021 Oct 27.
Published in final edited form as: J Psychiatr Res. 2021 Apr 13;143:471–480. doi: 10.1016/j.jpsychires.2021.03.046

Table 6. Negative binomial model with intra-COVID-19 pandemic scores on the Vancouver Obsessional Compulsive Inventory-Mental Contamination (VOCI-MC).

Parameter Estimates  
Parameter B Std. Error 95% Wald Confidence Interval Hypothesis Test Collinearity Statistics
      Lower Upper Wald Chi-Square df Sig. Tolerance VIF
(Intercept) .088 .4074 -.710 .887 .047 1 .829    
Age -.004 .0034 -.010 .003 1.210 1 .271 .845 1.184
Male (vs. other) gender -.102 .0810 -.260 .057 1.569 1 .210 .943 1.060
Lower (vs. higher) education levels -.118 .1394 -.391 .155 .718 1 .397 .951 1.052
Non-white (vs. white) ethnicity .208 .0900 .032 .385 5.350 1 .021 .931 1.074
Non-married (vs. married) status .035 .0840 -.129 .200 .178 1 .673 .898 1.114
Unemployed (vs. employed) -.207 .1625 -.526 .111 1.628 1 .202 .969 1.032
Lack vs. presence of past OCD diagnosis .208 .2074 -.198 .615 1.008 1 .315 .870 1.149
Negative (vs. positive) family history of OCD .053 .1630 -.266 .373 .107 1 .743 .902 1.109
Number of COVID-19 related events .035 .0345 -.033 .102 1.005 1 .316 .494 2.024
Number of COVID-19 related stressful events .056 .0257 .006 .107 4.822 1 .028 .500 1.999
CHIT total .035 .0070 .021 .049 24.677 1 <.001 .702 1.424
BIS total .004 .0088 -.013 .021 .229 1 .632 .819 1.221
SPQ total .031 .0093 .013 .049 11.195 1 .001 .612 1.633
DASS21 depression (before) .007 .0130 -.018 .033 .300 1 .584 .392 2.552
DASS21_anxiety (before) -.025 .0212 -.067 .017 1.396 1 .237 .381 2.622
DASS21_stress_(before) -.010 .0175 -.044 .025 .307 1 .580 .329 3.040
VOCI-MC total (before) .069 .0056 .059 .080 155.275 1 <.001 .508 1.969
(Scale) 1                
(Negative binomial) 1                

Footnote: CHIT= Cambridge-Chicago Trait Compulsivity Scale; BIS= Barratt Impulsiveness Scale; SPQ=Schizotypal Personality Questionnaire; DASS-21= Depression Anxiety Stress Scale-21; VOCI=Vancouver Obsessional Compulsive Inventory-Mental Contamination.