Fig. 2

SMRP levels for the seven groups. Bars represent median with interquartile 25–75. Group 1: healthy subjects without asbestos exposure; Group 2: healthy subjects only non-occupationally exposed to asbestos; Group 3: healthy subjects only occupationally exposed to asbestos (asbestos textile); Group 4: healthy subjects with mixed asbestos exposure; Group 5: asbestosis and pleural plaque; Group 6: asbestosis; Group 7: pleural plaque ***p < 0.0001; ** 0.0001 < p < 0.05