Figure 3From: Serum activin A and B levels predict outcome in patients with acute respiratory failure: a prospective cohort studyActivin A/B and follistatin concentrations in ARF patients at day zero (D0) or day 2 (D2), compared with reference group levels (reference data). Each patient group was sorted by diagnosis (DG Group). Differing letters (a or b) denote a significant difference from the reference data. (NO) non-operative and (PO) Post-operative.Back to article page