. 2014 Aug 21;2014:248461. doi: 10.1155/2014/248461

Table 3.

Mitotic index (MI) and frequency of chromosomal aberrations (CA) and micronucleus (MN) in 5000 cells analyzed (mean ± deviation) of Allium cepa meristematic cells after exposure to the wastewater samples from hospital and Berazategui plant.

Samples	MI	CA	MN
April
Negative control	13.06 ± 3.59	0.75 ± 0.96	0
Monday	9.30 ± 0.61	2.33 ± 1.15	0
Tuesday	9.91 ± 2.70	4.67 ± 1.53^a	0
Wednesday	8.65 ± 2.90	2.00 ± 1.00	0
Thursday	11.05 ± 1.25	2.00 ± 0.05^a	0
Friday	14.09 ± 3.30	1.25 ± 1.26	0
June
Negative control	58.24 ± 10.24	0.85 ± 1.05	0
Monday	62.44 ± 1.52	0.67 ± 1.15	0.67 ± 0.58
Tuesday	62.86 ± 4.35	0.75 ± 0.50	0.50 ± 1.00
Wednesday	73.16 ± 4.55	0.50 ± 0.71	0
Thursday	65.11 ± 2.86	1.00 ± 1.22	0
Friday	57.36 ± 10.63	1.00 ± 0.82	0
July
Negative control	58.24 ± 10.24	0.85 ± 1.05	0
Monday	47.25 ± 11.31	0.75 ± 0.95	0.75 ± 0.95
Tuesday	56.91 ± 8.42	2.00 ± 0.10^a	0
Wednesday	59.92 ± 9.82	2.00 ± 1.73	1.33 ± 1.53
Thursday	61.16 ± 2.94	1.75 ± 0.96^a	1.00 ± 1.41
Friday	53.74 ± 14.96	1.75 ± 1.71	0.25 ± 0.50
September
Negative control	63.33 ± 1.16	0.92 ± 0.06	0
Monday	59.27 ± 5.87	2.25 ± 2.21	0.75 ± 0.50^a
Tuesday	62.34 ± 6.94	1.40 ± 1.14	0.20 ± 0.45
Wednesday	62.49 ± 6.19	2.50 ± 1.29^a	1.00 ± 2.00
Thursday	63.27 ± 7.41	1.33 ± 0.58	2.00 ± 1.00^a
Friday	63.03 ± 7.97	3.00 ± 1.73^a	0.33 ± 0.57
Berazategui plant
Negative control	56.10 ± 11.39	0.75 ± 0.96	0
April	57.09 ± 9.76	0.43 ± 0.53	1.00 ± 1.15
MMS	69.03 ± 4.86	3.83 ± 2.14^a	1.80 ± 0.84^a

^aSignificantly different from negative control (P < 0.05), according to Kruskal-Wallis test.