condition mean min max ZT0-3 20.0694 19.8292 20.309600000000003 ZT4-7 23.1281 23.1281 23.1281 ZT8-11 25.57445 25.57445 25.57445 ZT12-15 0 0 0 ZT16-19 24.4452 24.4452 24.4452 ZT20-23 25.63095 25.63095 25.63095