Level of care and frequency of diagnostic codes for the cases identified as psoriasis alone in Skåne Healthcare Register 2005–2010; validation of diagnostic codes by review of medical records for a subsample of these cases.

†Any code consistent with psoriasis.
††Adjustment based on the proportion of correct diagnostic codes (the positive predicted value) of psoriasis in the SHR.
*4 cases found to be misclassified (moved from ≥2 primary care codes to 1 primary care code) °Medical records for 3 cases (one primary care 1 code and two primary care ≥2 codes) were impossible obtain due to administrative reasons.