condition mean min max ZT0-3 24.624516666666665 14.9646 30.629849999999998 ZT4-7 11.76665 11.76665 11.76665 ZT8-11 8.49194 8.49194 8.49194 ZT12-15 10.9721875 8.924775 13.0196 ZT16-19 14.458400000000001 14.458400000000001 14.458400000000001 ZT20-23 28.853949999999998 28.853949999999998 28.853949999999998