Table 1 Mean (SD) cervical impedance data in Ωm obtained from 12 subjects, 5 mm vs. 9 mm tetrapolar measuring probe.
5 mm probe | 9 mm probe | p value | |
|---|---|---|---|
Mean cervical impedance over the frequency range 4–819 kHz (Ωm) | 5.4 (1.6) | 2.8 (0.8) | < 0.001 |
Mean (95% CI) difference in resistivity values obtained by single observer taking two measurements 1–2 minutes apart. | 0.03(-0.8, 0.9) | -0.18 (-1.1, 0.7) | 0.69 |