The Public Assessment Reports contain all the scientific information about the trials and information on trial participants.
For the Pfizer trial, participants included 9.6% black/African, 26.1% Hispanic/Latino and 3.4% Asian. For the Oxford/AstraZeneca vaccine 10.1% of trial recipients were Black and 3.5% Asian.
There is no evidence either of the vaccines will work differently in different ethnic groups.
For both vaccines, people involved in the trials were from a range of various ages, as well as those with underlying health conditions. Both vaccine trials found that it was effective with people in these groups.
Details of trial participants for both vaccines are published online.
For the Pfizer/BioNTech vaccine information is available here: https://www.gov.uk/government/publications/regulatory-approval-of-pfizer-biontech-vaccine-for-covid-19
For the Oxford/AstraZeneca vaccine information is available here: https://www.gov.uk/government/publications/regulatory-approval-of-covid-19-vaccine-astrazeneca