condition mean min max ZT0-3 3.54064 3.54064 3.54064 ZT4-7 4.94344 4.94344 4.94344 ZT8-11 5.10336 5.10336 5.10336 ZT12-15 3.1381300000000003 3.1381300000000003 3.1381300000000003 ZT16-19 2.6786149999999997 2.6786149999999997 2.6786149999999997 ZT20-23 2.3767 2.3767 2.3767