condition mean min max ZT0-3 1.69533 1.69533 1.69533 ZT4-7 1.3078699999999999 1.3078699999999999 1.3078699999999999 ZT8-11 2.51756 2.51756 2.51756 ZT12-15 3.075155 3.075155 3.075155 ZT16-19 2.73707 2.73707 2.73707 ZT20-23 1.8464049999999999 1.8464049999999999 1.8464049999999999