the gids and uclh team stressed that although they couldn't show any benefit to these young people of the study used scores from reliable and widely—used parent and child questionnaires that assessed children's behavioural and emotional problems. as is a standard way of looking at data, the official results were based on averaging these scores. we both, in talking, basically said, well, in this situation the mean is essentially meaningless, because if you've got 44 young people, let's say, and let's say over a period of time, 11 do extremely well on the puberty blocker. 11 do quite well. 11 do extremely badly. and 11 do quite badly. and you make an average, you get, "oh — no change". the tavistock have made the study�*s raw data available to others. when macpherson and freedman reanalysed it, exploring changes at an individual level, they found something very different. the mental health of the majority of children was significantly impacted for both good and bad. after 12 months of puberty blocker injections, 34% had deteriorated, 29% had improved, 37% were unchanged. to be clear wha

the 2011 study of 44 12—15—year—olds, carried out by uclh and the tavistock�*s gender identity developmented scores from parent and child questionnaires that assessed children's behavioural and emotional problems. the finding of no change was based on averaging the scores for all participants. in this situation the mean is essentially meaningless, because if you've got 44 young people, let's say, and let's say over a period of time in 11 do extremely well on the puberty blocker. 11 do quite well, 11 do extremely badly and 11 do quite badly, and you make an average, you get no change. together with professor susan mcpherson from essex university, david freedman has reanalysed the study�*s raw data, this time exploring changes at an individual level. the work isn't peer reviewed yet but found that after 12 months of puberty blocker injections, the majority of children saw their mental health significantly impacted, for both good and bad. 34% had deteriorated, 29% had improved. 37% showed no change. we can't say that these changes in well—being were caused by being on the puberty blockers bec