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Table 2 Summary of intra- and inter-observer limits of agreement of resistivity values (Ohms) derived at 14 frequencies by firm pressure of the 12 mm probe on cervix (n = 11).

From: Reproducibility and repeatability of measuring the electrical impedance of the pregnant human cervix-the effect of probe size and applied pressure

  Repeatability Reproducibility
  Observer 1 Observer 2 Inter-observer agreement
Test frequency Mean 1 st test Mean 2 nd test Mean difference Limits of agreement Mean 1 st test Mean 2 nd test Mean difference Limits of agreement Observer 1 Observer 2 Mean difference Limits of agreement
1 526.9 539.3 -12 -162 to 127 350.0 366.3 -16 -108 to 76 526.9 539.3 204 -626 to 1033
2 499.6 512.9 -13 -167 to 140 347.2 362.6 -15 -92 to 61 499.6 512.9 179 -636 to 993
3 438.7 453.7 -15 -161 to 131 317.6 329.8 -12 70 to 45 438.7 453.7 145 -594 to 884
4 352.2 365.5 -14 -133 to 106 268.2 275.4 -7 -45 to 30 352.2 365.5 103 -487 to 693
5 266.0 278.1 -12 -100 to 75 212.6 219.0 -7 -33 to 20 266.0 278.1 68 -368 to 503
6 210.3 215.5 -5 -46 to 35 175.8 181.2 -5 -31 to 20 210.3 215.5 44 -244 to 235
7 178.8 181.9 -3 -17 to 10 151.9 157.4 -6 -28 to 17 178.8 181.9 36 -135 to 206
8 157.9 158.5 -1 -10 to 9 140.8 145.0 -4 -26 to 17 157.9 158.5 25 -72 to 121
9 145.6 146.3 -1 -11 to 9 134.1 136.8 -3 -22 to 16 145.6 146.3 19 -50 to 87
10 136.8 136.5 0.5 -10 to 11 128.2 130.8 -3 -22 to 17 136.8 136.5 15 -40 to 71
11 129.0 127.7 1 -9 to 11 123.1 124.6 -1.5 -19 to 15 129.0 127.7 12 -42 to 66
12 118.9 117.5 1.5 -5 to 8 112.9 113.2 -0.2 -13 to 13 118.9 117.5 11 -31 to 53
13 96.6 96.6 0.1 -8 to 8 95.2 95.9 -0.7 -7 to 5 96.6 96.6 5 -32 to 43
14 54.6 54.4 0.5 -9 to 10 55.0 54.9 0.1 -11 to 11 54.6 54.4 -1 -34 to 33