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Table 1 Descriptive characteristics of the patients

From: Postoperative results of ventilation tube insertion: a retrospective multicenter study for suggestion of grading system of otitis media with effusion

  Grade 0 (n = 60) Grade I (n = 32) Grade II (n = 57) Grade III (n = 152) Grade IV (n = 410) Grade V (n = 301) p-value
Age (year) 7.0 ± 3.6a 6.3 ± 3.6 5.3 ± 3.1 5.1 ± 3.0 4.9 ± 2.3 5.5 ± 3.0 < 0.001b 0.046c
Sex         0.591
 Male 40 22 41 90 257 192  
 Female 20 10 16 62 153 109  
Laterality        0.748
 Right 27 16 33 80 200 150  
 Left 33 16 24 72 210 151  
Preoperative OME duration (month) - 3.6 ± 1.5 3.8 ± 2.0 3.9 ± 1.6 4.1 ± 1.9 4.1 ± 1.8 0.056
  1. Note: Values are presented as mean ± standard deviation or number
  2. VTI ventilation tube insertion, OME otitis media with effusion
  3. aAge at VTI in the contralateral ear because ear with grade 0 did not undergo VTI
  4. bp -value for difference in mean age from grade 0 to grade V
  5. cp -value for difference in mean age from grade I to grade V