Supplementary Material for: Attitudes towards COVID-19 vaccination in adults with haematological malignancies.

Introduction: Despite people with haematological malignancies being particularly vulnerable to severe COVID-19 infection and complications, vaccine hesitancy may be a barrier to optimal vaccination. This study explored attitudes towards COVID-19 vaccination in people with haematological malignancies.

Methods: People with haematological malignancies at nine Australian health services were surveyed between June and October, 2021. Sociodemographic and clinical characteristics were collected. Attitudes towards COVID-19 vaccination were explored using the Oxford COVID-19 Vaccine Hesitancy Scale, the Oxford COVID-19 Vaccine Confidence and Complacency Scale, and the Disease Influenced Vaccine Acceptance Scale-Six. Open-ended comments were qualitatively analysed.

Results: A total of 869 people with haematological malignancies (mean age 64.2 years, 43.6% female) participated. Most participants (85.3%) reported that they had received at least one COVID-19 vaccine dose. Participants who were younger, spoke English as a non-dominant language, and had a shorter time since diagnosis were less likely to be vaccinated. Those who were female or spoke English as their non-dominant language reported greater vaccine side-effects concerns. Younger participants reported greater concerns about the vaccine impacting their treatment.

Conclusion: People with haematological malignancies reported high vaccine uptake, however, targeted education for specific participant groups may address vaccine hesitancy concerns, given the need for COVID-19 vaccine boosters.