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Table 2 Demographic characteristics of different groups

From: Rate of presence of 11 thoracic vertebrae and 6 lumbar vertebrae in asymptomatic Chinese adult volunteers

  Group Total
7C + 11T + 5L 7C + 11T + 6L 7C + 12T + 6L 7C + 12T + 5L
Number 12 5 11 265 293
Male/female 1/11 1/4 8/3 101/164 111/182
Age 35.9 ± 14.2 (23~70) 42.8 ± 9.9 (29~53) 40.2 ± 13.9 (24~63) 40.9 ± 12.8 (20~74) 40.8 ± 12.8 (20~74)
Weight (kg) 51.6 ± 8.7** (41~67) 58.7 ± 2.7 (55~62) 60.5 ± 8.9 (49~75) 61.5 ± 9.6 (40~95) 61.1 ± 9.6 (40~95)
Height (cm) 160 ± 6.0* (155~175) 163 ± 3.8 (158~167) 167 ± 8.0 (154~180) 164 ± 7.0 (148~186) 164 ± 7.0 (148~186)
BMI (kg/m2) 19.9 ± 2.2** (17.1~22.6) 22.1 ± 1.5 (21.2~24.8) 21.6 ± 2.6 (16.9~25.3) 22.8 ± 2.7 (16.2~32.9) 22.6 ± 2.8 (16.2~32.9)
  1. The range is shown in parentheses; “7C + 12T + 5L” stands for volunteers with normal number of vertebrae
  2. C cervical vertebrae, T thoracic vertebrae, L lumbar vertebrae
  3. *Compared with group 7C + 12T + 5L, p < 0.05
  4. **Compared with group 7C + 12T + 5L, p < 0.01