condition mean min max ZT0-3 277.956416 277.956416 277.956416 ZT4-7 335.82984550000003 335.82984550000003 335.82984550000003 ZT8-11 362.477983 362.477983 362.477983 ZT12-15 342.83081400000003 342.83081400000003 342.83081400000003 ZT16-19 325.770518 325.770518 325.770518 ZT20-23 282.10636850000003 282.10636850000003 282.10636850000003