The change in average site score from baseline assessed via endoscopy using the Modified Patterson Scale. The range for each site was 0-3: Normal, Mild, Moderate, Severe. A lower score means a better outcome.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

The changes in fat stranding using the CT Lymphedema and Fibrosis Assessment Tool (CT-LEFAT). The range for fat stranding includes 0-2: Normal, Mild Changes, Advanced Changes. A lower score means a better outcome.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

The changes in epiglottic thickness, and prevertebral soft tissue (PVST) using the CT Lymphedema and Fibrosis Assessment Tool (CT-LEFAT). Epiglottis and PVST are measured in mm. A lower measurement means a better outcome.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

The presence of swelling and inflammation as assessed through grading of external lymphedema via the Head and Neck Lymphedema and Fibrosis Grading criteria (HN-LEFG). A total of 9 sites are evaluated for the presence of lymphedema and graded from 1 (mild) to 3 (severe) at each site. The number of sites ranged from 0-9 with a total severity score ranging from 0-27. A lower score indicates a better outcome. A greater negative value indicates a greater reduction in swelling.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

The presence of swelling and inflammation are assessed by digital photography. A lower value means a better outcome. A greater negative value indicates a greater reduction in swelling. Three views are scored each with 30 grids. The percentage of views with visible swelling was determined. The score ranges from 0-100%.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Lymphedema Symptom Intensity and Distress Survey-Head and Neck (LSIDS-HN) assesses the measurement characteristics of a symptom burden for participants with head and neck lymphedema. Each symptom is rated on intensity and distress using a 5-point scale (1-Slight to 5-Severe), then added together. The values represent the mean score change from baseline. Score range: 0-10 (0 = symptom not present). A lower score means a better outcome.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Vanderbilt Head and Neck Symptom Survey plus General Symptom Survey (VHNSS plus GSS) assesses symptom burden and functional impairment. Values represent a median score change from baseline. Score range: 0-10. A lower score indicates a better outcome. A more negative value indicates a greater change from baseline.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Quality of life is assessed using the Linear Analog Self-Assessment. The overall well-being score ranges from 0-10 (0-As bad as it can be to 10-As good as it can be). The value represents the change from baseline. A positive change indicates an improvement.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Work Productivity and Activity Impairment Questionnaire (WPAIQ) PRO assessment asks questions about work and activity impairment due to lymphedema and other health problems. The values represent the difference from baseline percentage. A greater negative number indicates a greater reduction in impairment. Total score range: 0-100%

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participants not working, participant withdrawal, or death.

The 8-item Perceived Medical Condition Self-Management Scale (PMCSMS) is intended to measure patients' belief that they are capable of carrying out the self-management behaviors required by their medical condition. The scale is composed of four positively worded items and four negatively worded items, each rated on a five-point Likert scale (1=Strongly Disagree to 5=Strongly Agree). Negatively worded items are reversed scored, yielding a total score ranging from 8 to 40, with a higher score indicating stronger belief of perceived self-management competence.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Body Image Quality Life Inventory (BIQLI) assesses participants' body image using 7 point scale ranging from -3 (very negative) to +3 (very positive). Score range: -57 to +57. The values represent the change from baseline. A higher score indicates a better outcome.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Diet modifications will be assessed using the Automated Self-Administered 24-Hour Dietary Assessment Tool (ASA24). The ASA24 is a tool from National Cancer Institute (NCI) that enables multiple automatically coded self-administered 24-hour recalls and food records. Changes in total caloric intake will be evaluated.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.

Diet modifications will be assessed using the Automated Self-Administered 24-Hour Dietary Assessment Tool (ASA24). The ASA24 is a tool from National Cancer Institute (NCI) that enables multiple automatically coded self-administered 24-hour recalls and food records. Changes in total fat, carbohydrate, fiber, sugars, and protein will be evaluated.

The number of participants analyzed may differ from the overall number of patients analyzed due to the assessments not completed or incomplete, participant withdrawal, or death.