condition mean min max ZT0-3 1.2062424999999999 1.0279699999999998 1.5478425 ZT4-7 0.4987935 0.4987935 0.4987935 ZT8-11 0.50505 0.50505 0.50505 ZT12-15 0.24652 0.0 0.49304 ZT16-19 0.471821 0.471821 0.471821 ZT20-23 1.636775 1.636775 1.636775