condition mean min max ZT0-3 3.5437849999999997 3.5437849999999997 3.5437849999999997 ZT4-7 3.10808 3.10808 3.10808 ZT8-11 4.389385000000001 4.389385000000001 4.389385000000001 ZT12-15 4.471885 4.471885 4.471885 ZT16-19 6.024145 6.024145 6.024145 ZT20-23 4.66836 4.66836 4.66836