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Table 1 Demographic characteristics of head and neck cancer patients who underwent surgery with or without neck dissection between 1999 and 2012

From: Subsequent thyroid disorders associated with treatment strategy in head and neck cancer patients: a nationwide cohort study

  PTE + ND (N = 7460) PTE (N = 3730)  
N (%) N (%) P
Male 6500 (87.13) 3113 (83.46) <  0.001
Age (years)
 20–44 1465 (19.64) 783 (20.99) 0.08
 45–59 3237 (43.39) 1543 (41.37)  
  ≥ 60 2758 (36.97) 1404 (37.64)  
Region of Taiwan    0.80
 North 2504 (33.57) 1271 (34.08)  
 Central 1666 (22.33) 836 (22.41)  
 South 2759 (36.98) 1347 (36.11)  
 East and offshore 531 (7.12) 276 (7.40)  
Enrollee category    0.24
 1 565 (7.57) 314 (8.42)  
 2 2410 (32.31) 1227 (32.90)  
 3 3765 (50.47) 1818 (48.74)  
 4 720 (9.65) 371 (9.95)  
Monthly income    0.004
  ≤ NT$ 15,840 2127 (28.51) 1139 (30.54)  
 NT$ 15,841–25,000 3997 (53.58) 1873 (50.21)  
  ≥ NT$ 25,001 1336 (17.91) 718 (19.25)  
Urbanization Level    0.02
 1 (most urbanized) 1868 (25.04) 999 (26.78)  
 2 1890 (25.34) 860 (23.06)  
 3 (least urbanized) 3702 (49.62) 1871 (50.16)  
Charlson comorbidity index    0.91
 0–2 3458 (46.35) 1739 (46.62)  
 3–4 2367 (31.73) 1168 (31.31)  
  ≥ 5 1635 (21.92) 823 (22.06)  
Subsequent therapy    
 Surgery 2176 (29.17) 704 (18.87) <  0.001
 Radiotherapy 1890 (25.34) 529 (14.18) <  0.001
 Chemotherapy 1544 (20.70) 387 (10.38) <  0.001
  1. PTE primary tumor excision, ND neck dissection