Baseline predictors
active joints, pain
Several baseline characteristics were selected beforehand and tested for predictive value for pain over time, first in a univariable and subsequently in a multivariable prediction model. In the multivariable model, higher VAS pain and number of active joints at baseline were significantly predictive of higher pain over time, whereas higher VAS physician, CHQ PhS and PsS were predictive of lower pain. Baseline symptom duration, NSAID use and VAS patient/parent were not predictive of pain during follow-up (Table Effect of baseline characteristics on pain over timeEffect of baseline characteristics on pain over time. Included baseline variables in univariate and multivariate analysis; VAS pain, VAS physician, VAS patient/parent general wellbeing, diagnosis, number of active joints, PhS, PsS, symptom duration and NSAID use. 