Fig. 5
From: Pulmonary function testing in preoperative high-risk patients
Scatter plots of the lung parameters examined in relation to body mass index (BMI). Legend: Boxplots (Figs. 2, 3, and 4) show the distribution of lung function parameters in relation to MET, ASA, and smoking status. Whiskers show the minimum and maximum of the values, the horizontal line in the boxes represents the median. Stars represent the level of significance, whereas **** is equivalent to p < 0.0001 and ** is equivalent to p < 0.01. Scatter plots (Fig. 5) show the relationship between lung function parameters and BMI with regression lines indicating the overall trend of data. Correlation: FVC: r = − 0.2319, p = 0.001; FEV1: r = − 0.0886, p = 0.189; DLCO: r = 0.2570, p = 0.002. Abbreviations: FVC forced vital capacity; FEV1 forced expiratory pressure in 1 s; DLCO diffusing capacity of the lung for carbon monoxide; MET metabolic equivalents of task; NS never smoker; FS former smoker; CS current smoker; BMI body mass index