An image forming apparatus including a rotary member having an image formation area, and a scale located at a position outside of the image formation area and on an inner circumference of the rotary member. The dynamic wettability of a medium is a measure of how quickly a given liquid is absorbed by the medium. After receiving the overhead information, the wireless device decodes the new program but continues to decompress the current program. The outer ends of the light conduct posts are in convex shapes while the inner ends are concave shapes to allow the light source generated by the illuminant to be conducted outward as well as displayed by the indicating front panel. The delivered power is adjusted based at least in part on the feedback signal to compensate for power variance along the patient cable. The method includes the steps of retrieving a test for assessing risk of coronary heart disease, the test including a plurality of data fields relating to coronary risk factors; accessing a database to populate the data fields with information of an individual patient; and calculating a risk assessment of the individual patient developing coronary heart disease.