condition mean min max ZT0-3 258.9 258.9 258.9 ZT4-7 176.3 176.3 176.3 ZT8-11 510.75 510.75 510.75 ZT12-15 583.2 583.2 583.2 ZT16-19 465.34999999999997 465.34999999999997 465.34999999999997 ZT20-23 338.35 338.35 338.35