condition mean min max ZT0-3 2.0242725 1.887715 2.16083 ZT4-7 2.54125 2.54125 2.54125 ZT8-11 2.75741 2.75741 2.75741 ZT12-15 0 0 0 ZT16-19 2.1898999999999997 2.1898999999999997 2.1898999999999997 ZT20-23 2.94895 2.94895 2.94895