condition mean min max ZT0-3 9.278377500000001 8.65659 9.900165000000001 ZT4-7 9.57963 9.57963 9.57963 ZT8-11 7.103835 7.103835 7.103835 ZT12-15 0 0 0 ZT16-19 8.910125 8.910125 8.910125 ZT20-23 11.4949 11.4949 11.4949