condition mean min max ZT0-3 19.5707 19.0034 20.137999999999998 ZT4-7 24.92725 24.92725 24.92725 ZT8-11 18.31605 18.31605 18.31605 ZT12-15 0 0 0 ZT16-19 23.23065 23.23065 23.23065 ZT20-23 27.506999999999998 27.506999999999998 27.506999999999998