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Table 6 The frequency distribution of cervical segments corresponding to each plane in 600 healthy subjects

From: Normal radiological anatomy of thyroid cartilage in 600 Chinese individuals: implications for anterior cervical spine surgery

Level SBTC IBTC IBCC
Male* (%) Female (%) All (%) Male* (%) Female (%) All (%) Male* (%) Female (%) All (%)
C3/4 8 (2.1) 4 (1.9) 12 (2.0) 0 0 0 0 0 0
C4 138 (35.4) 125 (59.5) 263 (43.8) 4 (1.0) 0 4 (0.7) 0 0 0
C4/5 142 (36.4) 62 (29.5) 204 (34.0) 38 (9.7) 78 (37.1) 116 (19.3) 0 0 0
C5 74 (19.0) 19 (9.0) 93 (15.5) 180 (46.2) 101 (48.1) 281 (46.8) 0 20 (9.5) 20 (3.3)
C5/6 16 (4.1) 0 16 (2.7) 102 (26.2) 31 (14.8) 133 (22.2) 16 (4.1) 61 (29.0) 77 (12.8)
C6 12 (3.1) 0 12 (2.0) 50 (12.8) 0 50 (8.3) 134 (34.4) 95 (45.2) 229 (38.2)
C6/7 0 0 0 12 (3.1) 0 12 (2.0) 134 (34.4) 34 (16.2) 168 (28.0)
C7 0 0 0 4 (1.0) 0 4 (0.7) 82 (21.0) 0 82 (13.7)
C7/T1 0 0 0 0 0 0 16 (4.1) 0 16 (2.7)
T1 0 0 0 0 0 0 8 (2.1) 0 8 (1.3)
Total 390 (100) 210 (100) 600 (100) 390 (100) 210 (100) 600 (100) 390 (100) 210 (100) 600 (100)
  1. Percentages are shown in brackets
  2. SBTC superior border of the thyroid cartilage, IBTC inferior border of the thyroid cartilage, IBCC inferior border of the cricoid cartilage
  3. *p < 0.001 for males versus females using the chi-squared test