I could not find an analysis of such statistics. The reality of communication during pre-modern times though I would think render any claim to empiricism, merely conjecture. Only the absolute elite, or mundane scribe or accountant, typically recorded in any kind of permanent media.
However I did find a study held in
Mythopedia (no bias there of course), called
Three Ancient Reports of Near-Death Experiences: Bremmer Revisited Marinus van der Sluijs, M.A.London, UK. The third near death experience being more of a trancendental meditation, and not a 'death' event - I have left it out.
Er the Pamphylian
Death: Slain in Battle
Awoke: On his funeral pyre after 12 days
Deity Observed: Female goddess of necessity/force, Ananke; The Three Fates, Clotho, Atropos, and Lachesis (Birth/Embodiment, Fate and Death)
Observed: Souls moving in large numbers throughout heaven, and then after 7 days they were required to enter a giant rainbow pillar, much brighter than a rainbow. This pillar was the female deity Ananke's 'necessity' - the force that drives all things. The people selected from The Three Fates, their allotment for the next life, and then drank from a river which erased their memories - entering on the eighth day into their next life.
Thespesius of Soli (His born again name post-death)
Death: Fall and Concussion Event
Awoke: At his funeral after 3 days
Deity Observed: The Framers
Observed: His self arose from his body. His 'breath' was his whole being and he had 360 degree vision. Met his family member who had died when young. This family member took him on a tour of the life after. He showed him Lethe (Oblivion) along with a 'region of "those who were suffering punishment". His final vision was of ‘‘the souls returning to a second birth, as they were forcibly bent to fit all manner of living things and altered in shape by The Framers of these [living things]."
The common elements I estimate (not science, but a reasoned guess) from reading this study.
1. They saw what they were trained to expect.
2. Recorded/Noteworthy/Influential ancient NDE's involved more often than today, heavily traumatic and cruel forms of actual death-inducing events. Not the calm sated environment of a hospital. Nor could their actual death of course, be verified.
3. Recorded/Noteworthy/Influential ancient NDE's tended to focus judgement/puishment and an abyss (Sheol, Lethe, etc). Hell as we know it, was not introduced until well after the 4th Century bce.
4. Near Death Experiencers in ancient civilized contexts, became spiritual-religious celebrities. This compromised their objectivity and would lend to a more up-spun portion of hellish, judgement and visceral-reaction-inducing recounts.
5. Nobody was going to leave their vital chores and travel two days to attend a lecture featuring ushy-gooshy feel good, run of the mill NDE's. They got that from grandma when she was dying in the back room. Pleasant NDE's were much less often recorded, as they were gauche and uninteresting.
6. Such visceral-horror movie fodder bore the dual benefit (silent partnership) of increased gate/book proceeds and also served to increase the tithes to the religious houses.
We see this today, wherein evangelical NDE media outlets tend to push classic Hell NDE's, and certain researchers find their revenue to go up substantially if they focus on hell as their specialty, while more secular NDE researchers find them much less often (8 to 1 swings in bias). I suspect this played out as a common theme. What these six self-reinforcing social mechanisms (a Lindy mechanism called an Ontological Spiral) served to do, was to amplify the negative NDE artificially. No wonder we created such horrid religions in the past.