condition mean min max ZT0-3 33.474342 33.474342 33.474342 ZT4-7 17.0074885 17.0074885 17.0074885 ZT8-11 17.7012725 17.7012725 17.7012725 ZT12-15 30.204275000000003 30.204275000000003 30.204275000000003 ZT16-19 30.568613499999998 30.568613499999998 30.568613499999998 ZT20-23 20.977991000000003 20.977991000000003 20.977991000000003