Table 1 Intensity of congestion, mean (± standard deviation) number of mast cells (per mm²), mean (± standard deviation) epithelial thickness of the dorsum and the ventral surface (in microns) and mean (± standard deviation) of the number of nucleoli organizing regions (NORs) in the epithelium of the dorsal and ventral surfaces of the tongue by study group and exposure time (n = 80)

SG 1D

5/5 (100%)^a

0/5 (0%)^a

51.20 (15.04)^a

34.55 (9.86)^a

22.44 (4.23)^a

396.6 (3.78)^a

394.2 (13.55)^a

SG 2D

5/5 (100%)^a

0/5 (0%)^a

53.00 (8.65)^a

27.85 (7.87)^a

27.58 (9.28)^a

398 (12.57)^a

374 (11.00)^a

SG 3D

5/5 (100%)^a

0/5 (0%)^a

57.4 (11.13)^a

30.86 (2.76)^a

28.50 (17.07)^a

405.8 (20.27)^a

378.8 (5.40)^a

SG 8D

5/5 (100%)^a

0/5 (0%)^a

62.2 (14.86)^a

27.71 (6.18)^a

21.73 (1.99)^a

425.4 (20.18)^a

359.8 (5.76)^a

LCG 1D

5/5 (100%)^a

0/5 (0%)^a

57.4 (15.72)^a

35.11 (5.03)^b

24.61 (6.84)^a

487.2 (6.97)^b

377.8 (10.18)^a

LCG 2D

5/5 (100%)^a

0/5 (0%)^a

57 (16.30)^a

28.88 (4.75)^a

24.02 (1.80)^a

479.6 (11.90)^b

363.4 (10.35)^a

LCG 3D

5/5 (100%)^a

0/5 (0%)^a

63.6 (11.55)^a

33.61 (6.11)^a

25.56 (5.81)^a

474.6 (13.93)^c

384.8 (5.97)^a

LCG 8D

5/5 (100%)^a

0/5 (0%)^a

46.2 (10.48)^a

36.70 (4.60)^b

29.70 (6.21)^a

467.6 (6.18)^c

394.2 (9.88)^a

MCG 1D

5/5 (100%)^a

0/5 (0%)^a

39.6 (12.03)^b

35.52 (4.16)^b

25.32 (5.44)^a

517 (21.62)^d

513.4 (4.21)^b

MCG 2D

5/5 (100%)^a

0/5 (0%)^a

59.8 (14.13)^a

37.21 (7.29)^b

28.68 (4.54)^a

508.4 (13.46)^d

506.2 (11.54)^b

MCG 3D

2/5 (40%)^b

3/5 (60%)^b

49.6 (10.82)^a

36.20 (3.10)^b

20.03 (3.03)^a

506 (5.33)^d

494 (11.00)^b

MCG 8D

5/5 (100%)^a

0/5 (0%)^a

50.8 (17.20)^a

31.98 (8.73)^a

29.24 (5.01)^a

467.6 (1.34)^c

394.2 (19.29)^a

HCG 1D

3/5 (60%)^b

2/5 (40%)^b

42.6 (15.63)^b

24.07 (5.64)^c

23.44 (8.22)^a

405.6 (28.93)^a

403.2 (22.86)^c

HCG 2D

3/5 (60%)^b

2/5 (40%)^b

40.2 (5.27)^b

30.81 (8.47)^a

27.70 (6.42)^a

461 (13.13)^c

387.2 (21.56)^a

HCG 3D

5/5 (100%)^a

0/5 (0%)^a

44 (12.18)^b

38.41 (4.52)^b

26.76 (3.52)^a

444.8 (20.46)^d

410 (27.16)^c

HCG 8D

3/5 (60%)^b

2/5 (40%)^b

32.2 (12.98)^b

35.97 (3.22)^b

23.93 (5.22)^a

466 (10.93)^c

377.2 (11.71)^a