Table 1.

Outline of thought control/suppression measures.

References; Country	Measure	Items	Description
Wells and Davies (1994); UK	TCQ	30	The TCQ is a self-report questionnaire that assesses the frequency of use of five strategies to coping with unwanted thoughts (distraction, social control, punishment, worry, and reappraisal). Each item is answered on a 4-point scale (1, never; 2, sometimes; 3, often; and 4, almost always)
Wegner and Zanakos (1994); USA	WBSI	15	Self-report inventory that assesses people's general tendency to suppress unwanted thoughts. Answers are given on a five-point Likert scale ranging from A (strongly disagree) to E (strongly agree).
Rassin (2003) van Schie et al. (2016); Netherlands	TSI/TSI-R	15/21	Self-report inventory to measure successful and unsuccessful thought suppression. Items are scored from 1 “strongly disagree” to 5 “strongly agree.” The TSI-R consists of 21 items.
Luciano et al. (2005); Spain	TCAQ	25	Self-report questionnaire to assess individual differences in the perceived ability to control unwanted intrusive thoughts (“I often cannot avoid having upsetting thoughts”). Items are rated on a 5-point Likert-type scale (A = strongly disagree, E = strongly agree). See item content in Supplementary Table 1.

TCAQ, Thought Control Ability Questionnaire; TCQ, Thought Control Questionnaire; TSI, Thought Suppression Inventory (– Revised); WBSI, White Bear Suppression Inventory.