condition mean min max ZT0-3 325.113381 325.113381 325.113381 ZT4-7 274.4810795 274.4810795 274.4810795 ZT8-11 195.953828 195.953828 195.953828 ZT12-15 203.8203465 203.8203465 203.8203465 ZT16-19 138.38498099999998 138.38498099999998 138.38498099999998 ZT20-23 143.88455249999998 143.88455249999998 143.88455249999998