condition mean min max ZT0-3 242.751605 242.751605 242.751605 ZT4-7 215.38034499999998 215.38034499999998 215.38034499999998 ZT8-11 234.487777 234.487777 234.487777 ZT12-15 220.433152 220.433152 220.433152 ZT16-19 316.63269 316.63269 316.63269 ZT20-23 386.079252 386.079252 386.079252