condition mean min max ZT0-3 0.254757375 0.21367125 0.29584350000000004 ZT4-7 0.8999885000000001 0.8999885000000001 0.8999885000000001 ZT8-11 1.3285049999999998 1.3285049999999998 1.3285049999999998 ZT12-15 0 0 0 ZT16-19 0.546914 0.546914 0.546914 ZT20-23 0.5070025 0.5070025 0.5070025