condition mean min max ZT0-3 104.502174 104.502174 104.502174 ZT4-7 243.0472145 243.0472145 243.0472145 ZT8-11 375.88268949999997 375.88268949999997 375.88268949999997 ZT12-15 254.57773 254.57773 254.57773 ZT16-19 223.43050449999998 223.43050449999998 223.43050449999998 ZT20-23 200.0340175 200.0340175 200.0340175