condition mean min max ZT0-3 1.352638 1.346131 1.359145 ZT4-7 3.6246400000000003 3.6246400000000003 3.6246400000000003 ZT8-11 12.863900000000001 12.863900000000001 12.863900000000001 ZT12-15 0 0 0 ZT16-19 6.239535 6.239535 6.239535 ZT20-23 1.79053 1.79053 1.79053