Bilirubin concentration measurement system

A bilirubin concentration measurement system, comprising:

• a sensor device attachable to a subject;
• and a terminal device capable of wirelessly communicating with the sensor device, wherein
• the sensor device comprises:
• a first light emitting diode configured to emit light in a first wavelength band at a first timing on skin of the subject to produce first reflected light;
• a second light emitting diode configured to emit light in a second wavelength band at a second timing on the skin of the subject to produce second reflected light;
• a photodiode configured to detect the first reflected light that is the light in the first wavelength band having been incident on the skin of the subject and been reflected at the first timing, and detect the second reflected light that is the light in the second wavelength band having been incident on the skin of the subject and been reflected at the second timing;
• and
• a first communication unit comprising a transmitter configured to wirelessly transmit information about intensities of the first and second reflected light detected by the photodiode, and
• the terminal device comprises:
• a second communication unit comprising a receiver configured to receive the information about the intensities of the first and second reflected light transmitted from the first communication unit;
• and
• a computing unit configured to calculate a bilirubin concentration,
• wherein:
• the photodiode is configured to detect, multiple times, each of the first and second reflected light at the first and second timings, and
• the computing unit is configured to:
• apply predetermined statistical processing to data corresponding to the intensities of the first and second reflected light detected multiple times, and
• classify the data corresponding to the intensities of the first and second reflected light detected multiple times into a plurality of classes corresponding to the intensities of the reflected light,
• wherein calculating the bilirubin concentration comprises selectively using data having cumulative relative frequencies in a predetermined range among the classified data corresponding to the intensities of the first and second reflected light, wherein the predetermined range is 0.05 to 0.4,
• wherein:
• the sensor device further comprises an exterior resin that encloses a substrate on which the first and second light emitting diodes and the photodiode are implemented,
• light emitting surfaces of the first and second light emitting diodes and a light receiving surface of the photodiode are exposed from a surface of the exterior resin configured to face the subject, and
• the surface of the exterior resin facing the subject has a shape corresponding to a shape of a part of the subject to which the sensor device is attached.