Impact of Skin Tone, Environmental, and Technical Factors on Thermal Imaging

Data Dictionary: Temperature Analysis Variables Study: Impact of Skin Tone, Environmental, and Technical Factors on Thermal Imaging Data Collection Period: March 26th to June 25th, 2024 Temperature Unit: Degrees Celsius (°C) Sample Size: N = 35 subjects Dataset Structure Temperature&ConditionData Tab: Contains all temperature measurements and experimental conditions Demographics&StudyInfo Tab: Contains participant demographic information and study metadata Temperature Variables (Temperature&ConditionData Tab) Variable Name Data Type Definition Subject.ID Text/Numeric Unique identifier assigned to each study participant Cooling Condition Categorical Test condition: • Baseline testing occurred prior to cooling intervention, • Cooled testing occurred following cooling intervention Body.Position Categorical Orientation of the participant • Knee Forward: Side lying with forward placement of top knee, creating an increase in flexion of the top hip • Knee Back: Side-lying with rearward placement top knee, creating a decrease in flexion of top hip • Knee Stacked: Side-lying with legs on top of one another and pillow between knees Lighting Categorical Lighting condition in the room during image collection • Room light: Ambient room lighting • Ring light: Room lights off, bright LED ring light on Distance Categorical Distance from the PSIS to the thermal camera • 35 cm • 50 cm Camera Categorical Thermal camera used for image collection • FLIR E8XT • FLIROne Pro Cooling_ROI Numeric Median temperatures in cooling region of interest, reported at baseline or cooled timepoint Cooling_ROI_Delta Numeric Difference between the median temperatures in the cooling region of interest between baseline and cooled under the same conditions Control_Region Numeric Median temperatures in control region, reported at baseline or cooled timepoint Control_Region_Delta Numeric Difference between the median temperatures in the control region between baseline and cooled under the same conditions ROI_vs_control_difference Numeric Difference between cooling region of interest and control region temperatures (Cooling ROI - Control Region), reported at baseline or cooled timepoint Sequence Numeric Integer value describing the sequence in testing that this test condition was evaluated. Demographics & Study Information Variables (Demographics&StudyInfo Tab) Variable Name Data Type Definition Subject ID Text/Numeric Unique identifier assigned to each study participant Age Numeric Participant age in years at time of data collection Sex Categorical Biological sex (Male/Female/Other as reported by participant) BMI Numeric Body Mass Index calculated as weight (kg) / height (m)² BMI Category Categorical Body Mass Index categories as defined by the CDC: • Underweight: < 18.5 kg/m² • Healthy Weight: 18.5 to < 25 kg/m² • Overweight: 25 to < 30 kg/m² • Obese: >30 kg/m² Race Categorical Self-reported race Ethnicity Categorical Self-reported ethnicity Smoking Status Categorical Self-reported smoking history Monk Skin Tone Scale Integer Monk Skin Tone Scale Level as measured at the inner forearm (1) Melanin Index Numeric Melanin index measured with the SkinColorCatch® at the inner forearm, and converted according to a logarithmic equation to the units reported by the ColorMeter DSM II 𝑦=𝑒((𝑥+623.18) 334.81 ) Eumelanin Human Skin Colour Scale - Modified Categorical Skin tone groupings, adapted from the scale initially described by Dadzie, et al. (2). Defined as: • Eumelanin low: <25, • Eumelanin intermediate low: 25 to <37.5, • Eumelanin intermediate: 37.5 to <50, • Eumelanin intermediate mid: 50 to <75, • Eumelanin intermediate high: 75 to <100, • Eumelanin high: ≥100. (3,4) First Camera Used Categorical Lists which camera was used first based on randomized sequence during testing Regional Definitions Cooling Region of Interest The primary target region where cooling intervention was applied. An elliptical region of interest was selected using a custom Python script that matched the outline of the circle drawn on the PSIS. Control Region A standardized region that did not receive the cooling intervention, automatically created and scaled proportionally to the cooling ROI served as an internal control. Temporal Definitions Baseline Temperature measurements taken prior to cooling intervention initiation. Cooled Temperature measurements taken immediately following the cooling intervention period. Delta (Δ) Calculations Temperature change calculated as: Cooled - Baseline Negative values indicate cooling, positive values indicate warming. Data Dictionary Version: 1.1 Last Updated: August 20, 2025 Contact: Sharon Sonenblum - [email protected]