Systems and methods for monitoring weight change trend of a person in bed

A method for monitoring a weight-change trend of a person lying in a bed, the method comprising:

• placing a plurality of weight sensors under the bed comprising a head end and a foot end, the plurality of weight sensors comprising at least two of the plurality of weight sensors disposed under the bed proximate to the head end;
• performing an initial calibration comprising:
• obtaining empty-bed readings from the at least two of the plurality of weight sensors disposed under the bed proximate to the head end;
• obtaining occupied-bed readings from the at least two of the plurality of weight sensors disposed under the bed proximate to the head end with the person lying on the bed;
• and
• computing a calibration factor based on a known weight of the person and on a difference between the occupied-bed readings and the empty-bed readings;
• obtaining, at a plurality of time points, readings from the at least two of the plurality of weight sensors disposed under the bed proximate to the head end with the person lying on the bed;
• evaluating a position consistency parameter using a left-right weight distribution between the at least two of the plurality of weight sensors disposed under the bed proximate to the head end;
• determining, for readings that satisfy the position consistency parameter, respective weight values for the person based on the calibration factor;
• and
• generating a trend result value for the person over time using the respective weight values.