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Table 1 Morphometric measurements of alveolar air space, perimeter and surface density.

From: Black tea prevents cigarette smoke-induced apoptosis and lung damage

Group No. of Air Spaces Total Area (A)* Total Perimeter (P)* P/A S/V
Air 148 ± 10 25576 ± 1754 7646 ± 1282 0.299 ± 0.049 0.235 ± 0.038
CS 84 ± 9 37879 ± 3931 7383 ± 919 0.197 ± 0.036 0.155 ± 0.028
BT 176 ± 12 33978 ± 1704 10239 ± 758 0.302 ± 0.027 0.237 ± 0.021
BT+CS 184 ± 15 35389 ± 2733 10917 ± 1215 0.309 ± 0.037 0.243 ± 0.029
  1. Values are means ± S.D. number of images analyzed in each group:8; A, Total area of air space; P, Total perimeter (contour length) of air space; P/A, perimeter per unit area; S/V (surface density) = π/4 × P/A. The groups represent: Air, air exposed; CS, exposed to CS; BT, air exposed guinea pigs given BT as the drink; CS+BT, CS-exposed guinea pigs given BT as the drink. * Arbitrary unit using NIH image