Table 2

Group comparison between the primary mediastinal lymphoma and thymic epithelial tumors

	Primary mediastinal lymphoma	Thymic epithelial tumors	Group comparison
	Primary mediastinal lymphoma	Thymic epithelial tumors	χ²	P
Age			55.19	< 0.001**
< 40	54	8
≥ 40	17	57
Sex			12.68	< 0.001**
Male	22	40
Female	49	25
Malignancy			33.21	< 0.001**
Malignant	71	40
Benign	0	25
SUVmax	16.55 ± 6.38	10.64 ± 6.16	28.18	< 0.001**
< 13.7	27	48	17.47	< 0.001**
≥ 13.7	44	17
SUVmean	9.80 ± 3.93	6.11 ± 3.55	28.93	< 0.001**
< 8.0	29	49	16.43	< 0.001**
≥ 8.0	42	16
MTV (cm³)	143.98 ± 149.93	84.99 ± 130.10	5.74	< 0.05*
< 115.8	39	53	10.9	= 0.001**
≥ 115.8	32	12
TLG (g/mL cm³)	1546.1 ± 1838.69	641.78 ± 1381.45	14.55	< 0.001**
< 1113.9	42	57	13.85	< 0.001**
≥ 1113.9	29	8

SUVmax, maximum standardized uptake value; SUVmean, mean standardized uptake value; MTV, metabolic tumor volume; TLG, total lesion glycolysis; * and ** represent significant differences of P < 0.05 and P < 0.01, respectively.