text: Yo, check it out, I got a tale to tell,
  'Bout coal miners, the lungs where they dwell.
  Two groups were studied, let me break it down,
  Group one, miners with no pneumoconiosis around.
  
  Now, this group was split, 1A and 1B,
  1A had 62 miners, can't you see?
  Most had simple pneumoconiosis in their chest,
  But a few had clear films, they were put to the test.
  
  Spirometry was normal, that's what they found,
  But they claimed respiratory symptoms all around.
  Moving on to 1B, 25 miners in the mix,
  Radiographic evidence, pneumoconiosis fix.
  
  Their spirometric findings were normal and clear,
  But the disease was present, that was their fear.
  Now, let's talk group two, with complications high,
  25 men with pneumoconiosis, oh my!
  
  In simple pneumoconiosis, compliance was fine,
  But in complicated cases, it took a decline.
  Retraction coefficient was either normal or low,
  Except in advanced cases, where it started to grow.
  
  When it came to fibrosis or emphysema game,
  Simple pneumoconiosis showed more of the latter's fame.
  But in severe complications, fibrosis took the lead,
  Changes in the lungs, that's what they'd concede.
  
  Now, let's focus on subgroup 1B some more,
  Dynamic compliance, respiratory rates galore.
  Seventeen subjects in the group displayed,
  Frequency dependence, airflow resistance they conveyed.
  
  This finding had no link to bronchitis, you see,
  But suggested resistance in the smallest airways, key.
  So, that's the story of the miners and their lungs,
  Mechanical properties, where the issue sprung.