Table 4.

Body and organ weights after MTBE exposure: 28-day drinking water study in adult male BALB/c mice

	Tap water control	80 ppb MTBE	800 ppb MTBE	8000 ppb MTBE
	Absolute weight (g)
Final body weight	28.0 ± 1.7	27.8 ± 2.0	28.5 ± 1.1	27.1 ± 2.1
Testes	0.202 ± 0.01	0.208 ± 0.02	0.208 ± 0.02	0.192 ± 0.01
Epididymides	0.073 ± 0.01	0.074 ± 0.01	0.074 ±0.01	0.072 ± 0.01
Seminal vesicles	0.25 ± 0.07	0.23 ± 0.06	0.21 ± 0.05	0.23 ± 0.06
Liver	1.50 ± 0.13	1.48 ± 0.21	1.57 ± 0.09	1.49 ± 0.13
Brain	0.43 ± 0.03	0.44 ± 0.02	0.44 ± 0.04	0.41 ± 0.04
	Ratio of organ:final body weight (%)
Testes	0.72 ± 0.03	0.75 ± 0.08	0.73 ± 0.04	0.71 ± 0.05
Epididymides	0.26 ± 0.02	0.27 ± 0.03	0.26 ± 0.02	0.25 ± 0.02
Seminal vesicles	0.91 ± 0.25	0.82 ± 0.18	0.73 ± 0.18	0.85 ± 0.16
Liver	5.33 ± 0.34	5.30 ± 0.42	5.48 ± 0.35	5.48 ± 0.19
Brain	1.56 ± 0.12	1.59 ± 0.15	1.56 ± 0.10	1.53 ± 0.14

Note: Values shown are mean ±standard deviation, n=6. No significant differences were observed across the groups (p>0.05).