condition mean min max ZT0-3 0.215994297 0.18525540699999998 0.24673318700000002 ZT4-7 0.652320872 0.428351268 0.876290476 ZT8-11 1.83418625275 1.1714814725 2.496891033 ZT12-15 3.341438748 2.855205556 3.82767194 ZT16-19 5.04112862225 3.6567114284999995 6.425545816 ZT20-23 8.792672574 8.2299667735 9.355378374499999