condition mean min max ZT0-3 1.8163049999999998 1.392005 2.240605 ZT4-7 2.911665 2.911665 2.911665 ZT8-11 0.569315 0.569315 0.569315 ZT12-15 0 0 0 ZT16-19 0.5579885 0.5579885 0.5579885 ZT20-23 1.5788099999999998 1.5788099999999998 1.5788099999999998