condition mean min max ZT0-3 2.2587864166666667 0.00848425 3.4441699999999997 ZT4-7 2.412465 2.412465 2.412465 ZT8-11 0.34410400056023 0.34410400056023 0.34410400056023 ZT12-15 3.670595 3.0000400000000003 4.34115 ZT16-19 5.515965 5.515965 5.515965 ZT20-23 2.2655000000000003 2.2655000000000003 2.2655000000000003