condition mean min max ZT0-3 2.7877466666666666 1.7260550000000001 3.3383 ZT4-7 1.8926794999999998 1.8926794999999998 1.8926794999999998 ZT8-11 0.8277460000000001 0.8277460000000001 0.8277460000000001 ZT12-15 1.9935049999999999 1.82008 2.16693 ZT16-19 2.8568949999999997 2.8568949999999997 2.8568949999999997 ZT20-23 5.0232600000000005 5.0232600000000005 5.0232600000000005