Table 9.

Predicted associations between IPQ-O and other measures to assess construct validity

	Predicted associations with IPQ-O sub-scales
Continuous variables -
OCD severity (Y-BOCS)	Positively correlated with identity, consequences and permanence.
Depression (PHQ-9)	Positively correlated with: identity, consequences, permanence, emotional representation and own characteristics attributions. Negatively correlated with control and coherence.
Anxiety (GAD-7)	Positively correlated with: identity, consequences, permanence, emotional representation. Negatively correlated with coherence.
Attitudes towards seeking mental health services (IASMHS)	IASMHS Openess sub-scale: Positively correlated with coherence. IASMHS Indifference to stigma sub-scale: Positively correlated with coherence (greater indifference to stigma associated with better coherence) and spectrum beliefs (beliefs that OCD is on a spectrum will be associated with less concern about stigma)
Functioning (WSAS)	Positively correlated with consequences. Negatively correlated with control.
Categorical variables - condition management
No previous treatment for OCD (yes/no)	People who have low perceptions of control and permanence or perceive OCD as a spectrum condition would be less likely to have received treatment for OCD.
Received talking therapy for OCD (yes/no)	People who have received previous talking therapy for OCD will have significantly greater scores on the control sub-scale.
Received medication for OCD (yes/no)	People who have received medication for OCD will have significantly greater scores on the permanence sub-scales and lower scores on the spectrum sub-scale
Plans to seek help in future (yes/no) - NHS Including: NHS General Practitioner, Self-referral to mental health services e.g. Improving Access to Psychological Therapies services (IAPT)	People who plan to seek NHS help in the future will score more highly on the control and permanence sub-scales. People who plan to seek help will score lower on the spectrum sub-scale.
Plans to seek help in future (yes/no) - ‘other’ Including: charity organisations, support groups, internet forums, use of self-help books	People who plan to seek ‘other’ help in the future will score more highly on the control and permanence sub-scales. People who plan to seek help will score lower on the spectrum sub-scale.
Plans to seek help in future (yes/no) - private therapy	People who plan to seek private therapy in the future will score more highly on the control and permanence sub-scales. People who plan to seek help will score lower on the spectrum sub-scale.