condition mean min max ZT0-3 185.544618 185.544618 185.544618 ZT4-7 163.866672 163.866672 163.866672 ZT8-11 144.57601449999999 144.57601449999999 144.57601449999999 ZT12-15 145.6316955 145.6316955 145.6316955 ZT16-19 182.177592 182.177592 182.177592 ZT20-23 141.9731395 141.9731395 141.9731395