condition mean min max ZT0-3 2114.689345 2114.689345 2114.689345 ZT4-7 2167.8925615 2167.8925615 2167.8925615 ZT8-11 1313.4572695 1313.4572695 1313.4572695 ZT12-15 808.421158 808.421158 808.421158 ZT16-19 1075.1837074999999 1075.1837074999999 1075.1837074999999 ZT20-23 1334.147794 1334.147794 1334.147794