Variables associated with VIP serum levels during follow-up of patients with early arthritis.

The longitudinal analysis was performed with data (logarithmic transformation of censored VIP levels; see figure S2) from 340 visits corresponding to the 88 patients with all information available in, at least, two visits. Model 1 was fitted using the continuous value of DAS28 as measure of disease activity while model 2 includes the categorical variable based in cut-off values of this index. The average number of visits by patient was 3.9. The table shows all the variables reaching p