condition mean min max ZT0-3 555.888188 555.888188 555.888188 ZT4-7 379.68701250000004 379.68701250000004 379.68701250000004 ZT8-11 398.795443 398.795443 398.795443 ZT12-15 659.0167635 659.0167635 659.0167635 ZT16-19 491.415549 491.415549 491.415549 ZT20-23 969.2862175 969.2862175 969.2862175