Electron microscopic results of stereological analysis
| Group | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| τ̄(endo) nm | 160±10 | 193±24 | 161±23 | 208±35 | 246±82 | 146±24 | 151±18 | 153±26 |
| τ̄(int) nm | 69±19 | 98±19 | 73±23 | 99±16 | 130±26 | 42±9 | 41±12 | 76±14 |
| τ̄(epi) nm | 139±21 | 227±62 | 171±45 | 217±59 | 269±72 | 170±25 | 167±27 | 171±45 |
| τ̄(bab) nm | 367±44 | 518±83 | 404±88 | 524±92 | 646±165 | 358±22 | 358±30 | 400±71 |
| SS(normal) % | 24.6±9.9 | 15.3±9.4 | 18.4±7.3 | 10.3±6.8 | 1.6±3.0 | 74.4±3.0 | 67.4±8.2 | 28.5±7.6 |
| SS(swollen) % | 70.6±7.5 | 49.4±19.9 | 65.0±16.1 | 62.7±14.6# | 27.4±18.5¶ | 25.6±3.0 | 32.7±8.2 | 71.2±7.9 |
| SS(fragmented) % | 4.8±4.9 | 35.3±27 | 16.6±13.6 | 27.0±16.1# | 71.0±21.4¶ | 0.00±0.00 | 0.00±0.00 | 0.3±0.38 |
| bab integrity index | 1.80±0.14 | 2.20±0.35 | 1.98±0.15 | 2.17±0.2# | 2.71±0.20¶ | 1.26±0.03 | 1.33±0.08 | 1.72±0.07 |
Stereological data are presented as mean±sd. τ̄: arithmetic mean barrier thickness; endo: endothelium; int: interstitium; epi: epithelium; bab: blood–air barrier; SS: surface area fraction of total surface area. #: p<0.05 versus group 5; ¶: p<0.05 versus group 4.