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Table 1 Airway sizes and airway to cricoid ratios (ACR) at specific sites for overall and specific age groups across childhood: mean ± SD cross sectional area (CSA, mm2) and mean ± SD airway to cricoid ratios (ACR).

From: Airway sizes and proportions in children quantified by a video-bronchoscopic technique

  Cricoid RMS RBI RLL LMS LLL LUL
Overall Group        
n 125 114 100 90 108 97 89
CSA mm 2 38.5 ± 8.26 29.95 ± 8.99 25.86 ± 8.70 18.54 ± 6.86 23.77 ± 8.66 16.53 ± 6.60 14.86 ± 6.35
ACR   0.85 ± 0.26 0.73 ± 0.24 0.55 ± 0.23 0.68 ± 0.27 0.48 ± 0.18 0.42 ± 0.18
Group I (age = 2.5 yrs)
n 72 67 60 50 64 56 48
CSA mm 2 34.71 ± 8.48 27.79 ± 7.48 23.98 ± 7.52 17.00 ± 5.73 23.09 ± 7.95 15 ± 6.62 12.75 ± 4.60
ACR   0.83 ± 0.23 0.71 ± 0.24 0.53 ± 0.22 0.70 ± 0.27 0.47 ± 0.20 0.37 ± 0.13
Group II (age >2.5 = 5 yrs)
n 28 28 22 21 24 22 21
CSA mm 2 36.89 ± 7.94 30.66 ± 10.07 26.80 ± 10.06 18.78 ± 6.58 22.57 ± 9.00 17.58 ± 6.53 15.64 ± 6.40
ACR   0.84 ± 0.23 0.72 ± 0.25 0.54 ± 0.20 0.64 ± 0.29 0.49 ± 0.19 0.42 ± 0.18
Group III (age >5 = 10 yrs)
n 25 19 18 19 20 19 20
CSA mm 2 37.81 ± 7.68 36.51 ± 9.31 30.98 ± 8.83 22.35 ± 8.53 27.40 ± 9.90 19.80 ± 5.54 19.10 ± 7.77
ACR   0.92 ± 0.29 0.80 ± 0.25 0.63 ± 0.26 0.66 ± 0.22 0.51 ± 0.13 0.53 ± 0.21