 The majority of patients (about 70%) have the "hot" type, which is said to be an acute form of CRPS.Cold CRPS is said to be indicative of a more chronic CRPS and is associated with poorer McGill Pain Questionnaire scores, increased central nervous system involvement, and a higher prevalence of dystonia.Prognosis is not favourable for cold CRPS patients; longitudinal studies suggest these patients have "poorer clinical pain outcomes and show persistent signs of central sensitisation correlating with disease progression".