condition mean min max ZT0-3 1.95668 1.26911 2.4488849999999998 ZT4-7 1.30145 1.30145 1.30145 ZT8-11 1.137925 1.137925 1.137925 ZT12-15 1.16001925 0.9742985000000001 1.34574 ZT16-19 2.266685 2.266685 2.266685 ZT20-23 3.14607 3.14607 3.14607