condition mean min max ZT0-3 0.989284 0.989284 0.989284 ZT4-7 1.2034989999999999 1.2034989999999999 1.2034989999999999 ZT8-11 1.184547 1.184547 1.184547 ZT12-15 0.671176 0.671176 0.671176 ZT16-19 1.233555 1.233555 1.233555 ZT20-23 1.22383 1.22383 1.22383