condition mean min max ZT0-3 334.29999999999995 334.29999999999995 334.29999999999995 ZT4-7 321.2 321.2 321.2 ZT8-11 353.95 353.95 353.95 ZT12-15 322.15 322.15 322.15 ZT16-19 410.35 410.35 410.35 ZT20-23 414.5 414.5 414.5