Fig. 4From: Mechanical ventilation patterns and trends over 20 years in an Israeli hospital system: policy ramificationsMonthly ventilator-days in the university hospital’s emergency department increased over the last 9 years of the study as displayed by the gray dashed regression line (y = − 0.01 × 2 + 1.02x + 15.62; r2 = 0.53). The vertical gridlines that indicate the January of each year illustrate that seasonal peaks occurred frequently during winterBack to article page