Table 1 The clinical features of the train and validation cohorts

Clinical feature	The training cohort			The validation cohort
Clinical feature	Parotid adenolymphoma n = 78	Parotid pleomorphic adenoma n = 98	p value	Parotid adenolymphoma n = 34	Parotid pleomorphic adenoma n = 42	p value
Gender
Male	44	40	0.04	21	16	0.04
Female	34	58	0.04	13	26
Age (years)	54.72 ± 1.67	46.45 ± 1.86	< 0.01	57.53 ± 1.81	51.71 ± 2.09	0.04
Smoking
Yes	48	40	< 0.01	21	12	< 0.01
No	30	58	< 0.01	13	30	< 0.01
Number of tumor
1	58	82	0.13	28	34	0.88
> 1	20	16	0.13	6	8	0.88
Capsule of tumor
+	24	26	0.54	8	6	0.30
−	54	72	0.54	26	36	0.30

Continuous variables were compared using independent t tests or Wilcoxon Rank Sum tests; Categorical variables were were compared using chi-square tests or Fishers exact tests

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