condition mean min max ZT0-3 4.69992 3.1313 5.801155 ZT4-7 1.2703950000000002 1.2703950000000002 1.2703950000000002 ZT8-11 2.25786 2.25786 2.25786 ZT12-15 6.203194999999999 5.397914999999999 7.008475 ZT16-19 5.98302 5.98302 5.98302 ZT20-23 6.10229 6.10229 6.10229