Taking an example of 100 airmen:[26]
55 killed on operations or died as result of wounds
three injured (in varying levels of severity) on operations or active service
12 taken prisoner of war (some injured)
two shot down and evaded capture
27 survived a tour of operations
I'm currently reading the Nuremberg Raid by Martin Middlebrook, itself very sobering. He quotes the figures for "any 100 airmen joining into heavy bomber crews at an Operational Training Unit and for whom the war lasted long enough for them to serve the full cycle of service in Bomber Command" (which I take to mean two tours, around 50 operational sorties):
Killed on operations 51
Killed in crashes in England 9
Seriously injured in crashes 3
Prisoner-of-War (some injured) 12
Shot down but evaded capture 1
Survived unharmed 24
This, of course, does not include training losses before getting to an OTU