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Table 1 Patients’ characteristics

From: Risk factors for aspiration pneumonia during concurrent chemoradiotherapy or bio-radiotherapy for head and neck cancer

Backgroundn (%)
Age
  < 70 years275 (74)
  ≥ 70 years99 (26)
Gender
 Male322 (86)
 Female52 (14)
ECOG performance status
 0234 (63)
 1121 (32)
 216 (4)
 33 (1)
Body mass index
  < 2097 (26)
  ≥ 20277 (74)
Primary site
 Larynx57 (15)
 Nasopharynx48 (13)
 Hypopharynx132 (34)
 Nasal sinus21 (6)
 Oropharynx101 (27)
 Oral cavity14 (4)
 Ear canal1 (1)
T-classification
 132 (9)
 2136 (36)
 386 (23)
 4a92 (25)
 4b28 (7)
N-classification
 076 (20)
 154 (15)
 2a19 (5)
 2b134 (36)
 2c75 (20)
 316 (4)
Tumor histology
 SCC347 (93)
 Others27 (7)
Brinkman index
  < 500131 (35)
  ≥ 500243 (65)
Habitual alcoholic consumption
 Yes221 (59)
 No153 (41)
Use of ACEi or ARB
 Yes69 (18)
 No305 (82)
Use of PPI or H2 blocker
 Yes198 (53)
 No176 (47)
Oral hygiene before treatment
 Good179 (48)
 Poor183 (52)
Coexistence of other malignancies
 Yes45 (12)
 No329 (88)
Charlson comorbidity index
 0–1293 (78)
  ≥ 281 (22)
Serum albumin before treatment
 Within normal limits313 (84)
 Less than normal range61 (16)
Hemoglobin before treatment
 Within normal limits265 (71)
 Less than normal range109 (29)
Use of sleeping pills before treatment?
 Yes185 (49)
 No189 (51)
Induction chemotherapy
 Yes97 (26)
 No277 (74)
Concurrent chemotherapy regimen
 CDDP-based278 (74)
 CBDCA-based64 (17)
 Cetuximab32 (9)
Radiation technique
 Conventional 3D-CRT253 (68)
 IMRT121 (32)
Radiation dose, Gy
 70Gy363 (97)
 60-70Gy3 (1)
  < 60Gy8 (2)
Irradiation field
 Local67 (18)
 Whole neck307 (82)
Percutaneous endoscopic gastrostomy prior to treatment
 Yes229 (61)
 No155 (39)
Treatment
 Inpatient185 (49)
 Outpatient189 (51)
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