condition mean min max ZT0-3 3.0869174999999998 1.2414824999999998 4.06145 ZT4-7 1.868325 1.868325 1.868325 ZT8-11 2.650615 2.650615 2.650615 ZT12-15 2.0198335 1.5293269999999999 2.5103400000000002 ZT16-19 2.057925 2.057925 2.057925 ZT20-23 1.55085 1.55085 1.55085