Overall, there was considerable convergence in the factor structure of the TOCS and existing OCD scales13,14,31–33. One important difference from previous studies is that we identified separate Counting/Checking and Rumination dimensions, which often cluster with other OC symptoms. Counting and Checking symptoms often cluster with Symmetry/Ordering and/or Hoarding13. The Rumination dimension contained items consistent with symptoms from the Sexual/Religious obsession dimension (symptoms not queried on the TOCS) from previous studies17,32,34.
