Interestingzz wrote:...This is an interesting subject. Is it just the top New York Marathon times that are slower or marathons in general, since the early '80's? It would seem a question that could be accurately, but perhaps not easily, answered by reviewing results of all marathons in 1981 and 1982 (hard to find?) with those of 2014 and 2015. How do the top 1000 or 2000 times of all marathons run in 1981 and 1982 compare with the top 1000 or 2000 times run in 2014 and 2015?...
http://www.arrs.net/YR_Mara.htmClick on (almost) any year to get a list of the top 200 marathon performances of that year. That is more of the pointy end of the list than you're asking for, but perhaps you can draw some conclusions that would hold true for the top 1000-2000 times for a given year.
2013-2015 data is not yet posted
2012, 200th fastest time = 2:09:40
2002 = 2:12:19
1992 = 2:14:22
1982 = 2:15:29
1981 = 2:15:44
1972 = 2:21:08
At the top end of the sport, clearly there is a lot more depth than 30-40 years ago. I suspect worldwide, that would hold true for the 1000th fastest marathon of the year or the 2000th. For US runners, I suspect the opposite is true - that the say 200th fastest US marathoner 30 years ago was faster than the 200th fastest today. I would base that assertion on the times US runners used to post at NYC and Boston.
One other thing I've studied is winning times at US marathons as well as how many runners break 2:20, 2:30; 2:45, 3:00. I only track about the largest 40 US marathons, plus a few others who have fast winning times. I have data for 2010 and 2013...
--2013: 11 US marathons won in 2:15:00 or faster, 182 sub 2:20 performances, 519 sub 2:30 performances, 1983 sub 2:45, 7425 sub 3:00.
--2010: 9 US marathons won in 2:15:00 or faster, 163 sub 2:20 performances, 519 sub 2:30 performances, 1811 sub 2:45, 6197 sub 3:00.
My "sub x:xx" stats are understated because I don't track ALL US marathons, but the study is the same for both years. And one other thing, my x:xx numbers include non-US runners at US races.