condition mean min max ZT0-3 161.155134 161.155134 161.155134 ZT4-7 132.052471 132.052471 132.052471 ZT8-11 138.615423 138.615423 138.615423 ZT12-15 175.568804 175.568804 175.568804 ZT16-19 239.9299115 239.9299115 239.9299115 ZT20-23 328.6121915 328.6121915 328.6121915