An optical fiber whose value of a ratio of a dispersion to the dispersion slope ranges between 50 nm and 150 nm at the wavelength of 1590 nm. Further, the method includes comparing each object of each state to produce a set of differences between states. Also claimed are a computer system and a computer-readable medium for fusing interaction data. Pelvic floor muscle strength is defined as a contact pressure increase detected on fixed probe surface under the muscle contraction.