condition mean min max ZT0-3 2172.9666666666667 1879.665 2333.5950000000003 ZT4-7 1491.605 1491.605 1491.605 ZT8-11 1334.505 1334.505 1334.505 ZT12-15 1941.6375 1759.77 2123.505 ZT16-19 2433.185 2433.185 2433.185 ZT20-23 2459.48 2459.48 2459.48