condition mean min max ZT0-3 2.8063624999999996 2.189715 3.4230099999999997 ZT4-7 7.945684999999999 7.945684999999999 7.945684999999999 ZT8-11 6.91457 6.91457 6.91457 ZT12-15 0 0 0 ZT16-19 6.382235 6.382235 6.382235 ZT20-23 6.25989 6.25989 6.25989