condition mean min max ZT0-3 17.865653333333334 7.23141 28.0142 ZT4-7 8.54703 8.54703 8.54703 ZT8-11 7.624775 7.624775 7.624775 ZT12-15 16.76165 15.45935 18.06395 ZT16-19 20.326900000000002 20.326900000000002 20.326900000000002 ZT20-23 22.195999999999998 22.195999999999998 22.195999999999998