condition mean min max ZT0-3 0.5834318333333333 0.463966 0.7584825 ZT4-7 1.238765 1.238765 1.238765 ZT8-11 0.778035 0.778035 0.778035 ZT12-15 1.16977375 1.1106850000000001 1.2288625 ZT16-19 0.903831 0.903831 0.903831 ZT20-23 0.6936804999999999 0.6936804999999999 0.6936804999999999