Algorithm 1. PPG Signal Data Collection and Analysis

1: Initialize parameters 2: SET frequency = 115.2 Hz 3: SET total subjects = 835 4: SET total samples per segment = 1700 5: SET segments per participant = 2 6: SET sample duration = 1 min 7: SET total duration = 15 min 8: SET fasting duration = 2 h after eating 9: SET glucose intake = 75 g of glucose-infused water 10: Data collection process 11: for each participant FROM 1 to total subjects do 12:    COLLECT participant data 13:   DISPLAY “Please agree to participate in the data collection” 14:    for segment number FROM 1 to segments per participant do 15:    RECORD PPG signal (segment number) 16:    end for 17:    participant data.age = GET age 18:    participant data.weight = GET weight 19:    participant data.blood glucose level = GET BGL(fasting) 20:    if participant is unaware of diabetes, then 21:      ADMINISTER glucose intake 22:    participant data. Blood glucose level = GET BGL(non-fasting) 23:    end if 24: end for