condition mean min max ZT0-3 674.442046 674.442046 674.442046 ZT4-7 608.6752799999999 608.6752799999999 608.6752799999999 ZT8-11 607.539212 607.539212 607.539212 ZT12-15 618.9256965 618.9256965 618.9256965 ZT16-19 612.162859 612.162859 612.162859 ZT20-23 645.330582 645.330582 645.330582