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Table 2 Comparison of study populations with missing blood pressure registration and registered blood pressure

From: High blood pressure and overweight in children with Legg-Calvé-Perthes disease: a nationwide population-based cohort study

  Missing values Registered BP p-value
n 99 93  
Age (mean (SD)) 5.7 (2.3) 6.4 (2.1) 0.03
Sex = Female (%) 23 (23.2) 19 (20.4) 0.77
Side = left (%) 47 (47.5) 50 (53.8) 0.47
Lateral Pillar (%)    0.30
  A 1 (1.0) 2 (2.2)  
  B 35 (35.4) 30 (32.3)  
  B/C 16 (16.2) 7 (7.5)  
  C 21 (21.2) 21 (22.6)  
  too early 26 (26.3) 33 (35.5)