condition mean min max ZT0-3 0.07568366666666666 0.0 0.167407 ZT4-7 0.6915870000000001 0.6915870000000001 0.6915870000000001 ZT8-11 1.5059550000000002 1.5059550000000002 1.5059550000000002 ZT12-15 1.20716425 0.743649 1.6706794999999999 ZT16-19 0.26447 0.26447 0.26447 ZT20-23 0.06589025 0.06589025 0.06589025