condition mean min max ZT0-3 2.614815 1.719295 3.510335 ZT4-7 3.119335 3.119335 3.119335 ZT8-11 1.2875535 1.2875535 1.2875535 ZT12-15 0 0 0 ZT16-19 1.9817300000000002 1.9817300000000002 1.9817300000000002 ZT20-23 2.1334600000000004 2.1334600000000004 2.1334600000000004