condition mean min max ZT0-3 220.484318 220.484318 220.484318 ZT4-7 233.8896505 233.8896505 233.8896505 ZT8-11 297.79451800000004 297.79451800000004 297.79451800000004 ZT12-15 322.76729850000004 322.76729850000004 322.76729850000004 ZT16-19 355.8542645 355.8542645 355.8542645 ZT20-23 366.4194745 366.4194745 366.4194745