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Figure 1 | BMC Pulmonary Medicine

Figure 1

From: Ageing and smoking contribute to plasma surfactant proteins and protease imbalance with correlations to airway obstruction

Figure 1

Box-and-whisker plots of SP-A, SP-D, MMP-9 and TIMP-1 in plasma (A, B, C and D, respectively). The boxes represent the 25th to 75th percentiles, the solid lines within the boxes show the median values, the whiskers are the 10th and 90th percentiles, and the points represent outliers. *: p < 0.05; **: p < 0.01; ***: p < 0.001 (between two groups, t-test).

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