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Table 1 Summary of intra- and inter-observer limits of agreement of resistivity values (Ohms) derived at 14 frequencies by firm pressure of the 3 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
1 872.4 877.4 -5 -222 to 212 889.9 907.3 -17.4 -180 to 145 872.4 889.9 -17 -1595 to 1560
2 923.9 918 6 -190 to 202 947.2 969.9 -22.6 -205 to 160 923.9 947.2 -23 -1717 to 1670
3 812.0 896.8 15 -141 to 171 940.7 963.2 -22.5 -209 to 164 912.0 940.7 -29 -1700 to 1642
4 863.0 839.0 24 -95 to 142 891.6 915.5 -23.9 -216 to 167 863.0 891.6 -26 -1419 to 1366
5 784.5 755.1 29 -72 to 130 810.7 835.8 -25.2 -223 to 173 784.5 810.7 -26 -1419 to 1366
6 718.9 684.5 34 -66 to 135 733.9 761.5 -27.6 -233 to 178 718.9 733.9 -15 -1253 to 1223
7 637.3 605.3 32 -69 to 133 635.6 659.9 -24.4 -239 to 190 637.3 635.6 -2 -1058 to 1062
8 552.1 524.9 27 -62 to 116 535.5 557.6 -22.0 -225 to 182 552.1 535.5 17 -844 to 878
9 468.5 451.0 17 -56 to 91 445.8 464.9 -19.1 -196 to 158 468.5 445.8 23 -636 to 681
10 389.9 379.4 11 -40 to 61 368.8 384.3 -15.5 -165 to 134 389.9 368.8 21 -460 to 502
11 316.7 316.1 1 -44 to 45 300.0 312.3 -12.3 -123 to 98 316.7 300.0 17 -307 to 340
12 251.7 252.6 -1 -32 to 30 233.5 243.9 -10.4 -94 to 73 251.7 233.5 18 -195 to 230
13 177.8 182.3 -5 -30 to 21 168.1 175.0 -6.8 -69 to 56 177.8 168.1 10 -122 to 141
14 91.5 102.0 -11 -39 to 17 99.1 98.8 0.3 -27 to 28 91.5 99.1 -8 -77 to 62