TABLE I.

Adrenal and thymus measurements

	Treatment	Adrenal wt. (mg)	% Body wt.	Thymus wt. (mg)	% Body wt.
P 11	WEIGH	7.24 ± 0.32	0.030 ± 0.001	94.66 ± 3.80	0.390 ± 0.011
	SAL	7.47 ± 0.32	0.030 ± 0.001	96.86 ± 3.79	0.388 ± 0.011
	MA	7.21 ± 0.32	0.030 ± 0.001	92.46 ± 3.79	0.376 ± 0.011
	FS	7.31 ± 0.32	0.030 ± 0.001	96.70 ± 3.79	0.391 ± 0.011
	ISO	7.44 ± 0.32	0.031 ± 0.001	91.90 ± 3.79	0.379 ± 0.011
P 15	WEIGH	10.84 ± 1.54	0.034 ± 0.004	135.40 ± 5.30	0.424 ± 0.013
	SAL	15.24 ± 1.53	0.047 ± 0.004	128.30 ± 5.29	0.409 ± 0.013
	MA	8.89 ± 1.56**	0.036 ± 0.004	82.61 ± 5.33****	0.329 ± 0.014****
	FS	11.59 ± 1.54	0.038 ± 0.004	120.3 ± 5.23†††	0.398 ± 0.013
	ISO	11.40 ± 1.53	0.036 ± 0.004	132.3 ± 5.23	0.422 ± 0.013

Adrenal and thymus least square mean weights for weighed only (WEIGH), saline (SAL), (+)-methamphetamine (MA), forced swim (FS), and isolation (ISO) treatments for P11 and P15. For comparison, each tissue was normalized to body weight and expressed as the percentage of tissue per total body weight,

^**= P < 0.01,

^****= P < 0.0001 compared with all other treatments,

^†††= P < 0.001 when compared with WEIGH and ISO.