condition mean min max ZT0-3 23380.233333333334 17726.15 29782.300000000003 ZT4-7 19859.55 19859.55 19859.55 ZT8-11 16566.9 16566.9 16566.9 ZT12-15 21767.5 20886.35 22648.65 ZT16-19 28987.199999999997 28987.199999999997 28987.199999999997 ZT20-23 33902.649999999994 33902.649999999994 33902.649999999994