Table 4 Comparisons of the inner diameters of the carotid arteries between different age groups
Inner diameter measured | Range (95% confidence interval) | Mean ± standard deviation | P | ||||||
|---|---|---|---|---|---|---|---|---|---|
 ≤ 45 years (n = 231) | 46–55 years (n = 276) | 56–65 years (n = 375) |  > 65 years (n = 300) |  ≤ 45 years (n = 231) | 46–55 years (n = 276) | 56–65 years (n = 375) |  > 65 years (n = 300) | ||
Left proximal carotid sinus (mm) | 8.44–14.72 (11.04–12.13) | 7.50–15.45 (10.85–11.89) | 6.33–15.35 (10.35–11.34) | 5.89–14.01 (9.47–10.43) | 11.58 ± 1.59 | 11.37 ± 2.08 | 10.84 ± 2.30 | 9.95 ± 2.07a,b,c |  < 0.001 |
Right proximal carotid sinus (mm) | 8.71–15.13 (11.36–12.47) | 7.46–16.24 (11.28–12.42) | 6.81–15.79 (10.82–11.78) | 6.69–14.61 (10.18–11.11) | 11.92 ± 1.64 | 11.85 ± 2.24 | 11.30 ± 2.29 | 10.65 ± 2.02a,b,c | 0.003 |
Left carotid sinus bulge (mm) | 8.43–14.51 (10.94–11.99) | 7.69–15.13 (10.94–11.88) | 6.69–15.00 (10.39–11.31) | 6.43–14.71 (10.08–11.06) | 11.47 ± 1.55 | 11.41 ± 1.90 | 10.85 ± 2.12 | 10.57 ± 2.11a,b | 0.036 |
Right carotid sinus bulge (mm) | 8.26–15.74 (11.35–12.64) | 7.55–15.71 (11.11–12.16) | 7.27–15.35 (10.88–11.75) | 7.14–14.48 (10.37–11.25) | 12.00 ± 1.91 | 11.63 ± 2.08 | 11.31 ± 2.06 | 10.81 ± 1.87a,b | 0.017 |
Left distal carotid sinus (mm) | 6.38–10.74 (8.19–8.94) | 6.45–10.25 (8.11–8.58) | 5.42–9.78 (7.24–7.74) | 5.14–9.84 (7.35–7.86) | 8.56 ± 1.11 | 8.35 ± 0.97 | 7.60 ± 1.11a,b | 7.49 ± 1.19a,b |  < 0.001 |
Right distal carotid sinus (mm) | 6.87–10.95 (8.56–9.26) | 6.59–10.39 (8.25–8.73) | 5.53–9.99 (7.53–7.99) | 5.83–9.75 (7.57–8.02) | 8.91 ± 1.04 | 8.49 ± 0.97 | 7.79 ± 1.00a,b | 7.76 ± 1.14a,b |  < 0.001 |
Left common carotid artery (mm) | 8.22–12.54 (10.01–10.76) | 8.22–13.56 (10.56–11.22) | 8.15–13.71 (10.72–11.28) | 8.53–13.47 (10.71–11.03) | 10.38 ± 1.10 | 10.89 ± 1.36 | 10.93 ± 1.42a | 11.00 ± 1.26a | 0.122 |
Right common carotid artery (mm) | 9.06–13.34 (10.83–11.57) | 8.72–14.40 (11.20–11.91) | 8.66–14.46 (11.26–11.86) | 9.23–13.90 (11.29–11.82) | 11.20 ± 1.09 | 11.56 ± 1.45 | 11.56 ± 1.48 | 11.56 ± 1.19 | 0.529 |