Nationality and Borders Bill (Fourteenth sitting)

What are the experts comparing with? My question is, will they be comparing the bone density or whatever with that of children of the same age in the UK, knowing that the development of children from other parts of the world is very different, or will they have a database of comparable images of the skeletal system—whichever part they are using—from each of the other countries? Is that something that is happening at the moment, or will they just be compared with UK-based children?