condition mean min max ZT0-3 48.84505 39.77175 57.918350000000004 ZT4-7 25.6496 25.6496 25.6496 ZT8-11 25.6717 25.6717 25.6717 ZT12-15 0 0 0 ZT16-19 30.97205 30.97205 30.97205 ZT20-23 34.36045 34.36045 34.36045