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Table 1 Geometric mean of number of fibers retained in the lung (geometric standard deviation)

From: Effects of rock wool on the lungs evaluated by magnetometry and biopersistence test

Observation period All fibers L ≤ 5 5 < L ≤ 20 20 < L WHO fibers
  10E5 fibers/g dry lung weight
1D group 93.3 (1.2) 45.6 (1.2) 41.4 (1.2) 6.2 (1.3) 47.6 (1.2)
3D group 85.6 (1.2) 41.5 (1.2) 38.8 (1.3) 4.1 (1.7) 43.0 (1.4)
14D group 65.5 (1.1)a 32.2 (1.2)a 29.8 (1.2) 2.7 (1.7)a 32.7 (1.3)
28D group 55.6 (1.2)a, b 26.4 (1.3)a, b 26.9 (1.1)a, b 2.0 (1.3)a 29.0 (1.1)a, b
  1. a: Comparison with the 1D group (p < 0.05)
  2. b: Comparison with the 3D group (p < 0.05)
  3. L = Fiber length (μm)
  4. WHO fibers: Fibers having a length of longer than 5 μm and width of shorter than 3 μm.