condition mean min max ZT0-3 503.934851 503.934851 503.934851 ZT4-7 476.70913900000005 476.70913900000005 476.70913900000005 ZT8-11 514.214329 514.214329 514.214329 ZT12-15 583.7604625 583.7604625 583.7604625 ZT16-19 552.253323 552.253323 552.253323 ZT20-23 515.318401 515.318401 515.318401