Fig. 4From: Flu-IV score: a predictive tool for assessing the risk of invasive mechanical ventilation in patients with influenza-related pneumoniaKaplan–Meier curve showing the probability of IMV according to the Flu-IV score (Flu-IV score < 5: Low risk; Flu-IV score ≥ 5: High risk). Patients with Flu-Iv score ≥ 5 were significantly more likely to require IMV relative to low-risk patients (47.4% vs. 1.9%, log-rank test, p < 0.001)Back to article page