Figure 5
![Figure 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1475-925X-8-10/MediaObjects/12938_2009_Article_296_Fig5_HTML.jpg)
Variability of cervical resistivity by application pressure for each probe studied by Observer 1. a: Mean (SE) cervical resistivity values across 14 measured frequencies using the 3 mm probe by force of probe application to the cervix. b: Mean (SE) cervical resistivity values across 14 measured frequencies using the 12 mm probe by force of probe application to the cervix.