Fig. 1From: Time spent in oxygen saturation 95–99% is associated with reduced mortality in critically ill patients with mechanical ventilationa Adjusted odds ratio for hospital mortality according to different SpO2 categories. The proportion of time spent in thirteen different SpO2 categories (≤ 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and 100%) was considered as a continuous variable, ranging from 0 to 100%, and was included in separate multivariable regression models along with the confounders. In total, 13 models were created. The adjusted odds ratio for each SpO2 category and 95% confidence intervals (error bars) were calculated after adjusting for age, body mass index (obesity or non-obesity), admission diagnosis, comorbidities (diabetes mellitus, cancer), time-weighted mean FiO2, time-weighted mean pH, time-weighted mean PaCO2, sequential organ failure assessment score (not including the respiratory part), and use of dialysis. An odds ratio is calculated per 5% increase in time in each given category. SpO2, arterial oxygen saturation; FiO2, fraction of inspired oxygen; PaCO2, partial pressure of arterial carbon dioxide. b Observed hospital mortality of four predefined time ranges (0–25%, 25–50%, 50–75%, and 75–100%) spent in three different SpO2 categories (≤ 94%, 95–99%, and 100%). Figures on each histogram column represented the crude hospital mortalityBack to article page