condition mean min max ZT0-3 11.788174999999999 11.4839 12.09245 ZT4-7 9.393145 9.393145 9.393145 ZT8-11 7.325245000000001 7.325245000000001 7.325245000000001 ZT12-15 0 0 0 ZT16-19 10.55435 10.55435 10.55435 ZT20-23 11.630500000000001 11.630500000000001 11.630500000000001