Table 1 Clinical information of the patients investigated (N = 144)

Age (years)

13.91 ± 4.516

 3–5

14

9.7

 6–10

15

10.4

 11–15

51

35.4

 16–20

64

44.4

Sex

 Male

64

44.4

 Female

80

55.6

Category of salivary gland

 Major

106

73.6

 Minor

38

26.4

Tumor behavior

 Benign

106

73.6

 Malignant

38

26.4

Recurrence

 Present

39

27.1

 Absent

105

72.9

Duration of recurrence (months)

57.42 ± 23.652

 7–12

10

6.9

 13–36

26

18.1

 37–60

6

4.2

 61–72

102

70.8

Methods of recurrence detection

 Physical examination

91

63.2

 Imaging

53

36.8

Tumor size (cm)

7.41 ± 4.586

  ≤ 5

35

24.3

  > 5

109

75.7

Duration of onset of symptoms to hospitalization (months)

27.35 ± 26.761

  ≤ 10

44

30.6

  > 10

100

69.4

Lymph node involvement

 Yes

16

41.0

 No

23

59.0

Tumor grade

 I

8

20.5

 II

17

43.6

 III

14

35.9

Category of malignant tumors

 Primary

34

23.6

 Metastatic tumors to salivary glands

5

3.5

Treatment modalities

 Surgery

65

45.1

 Surgery and radiotherapy

15

10.4

 Radiotherapy

21

14.6

 Chemotherapy

30

20.8

 Radiochemotherapy

13

9.0

Complications

 Facial nerve weakness

13

9.0

 Frey’s syndrome

8

5.6

 Keloid formation

5

3.5

Status of the patients at last contact

 Alive

120

83.3

 Dead

6

4.2

 Unknown

18

12.5

Anatomical location

 Buccal

15

10.4

 Soft palate

14

9.7

 Hard palate

7

4.9

 Parotid gland

82

56.9

 Submandibular gland

20

13.9

 Sublingual gland

4

2.8

 Lower lip

2

1.4