condition mean min max ZT0-3 146.082901 144.92694240000003 147.23885959999998 ZT4-7 154.401797175 134.1830611 174.62053325 ZT8-11 106.0342935575 84.252568385 127.81601873 ZT12-15 49.9791627575 47.17575182 52.782573694999996 ZT16-19 117.2820014775 88.366904855 146.1970981 ZT20-23 219.80051095 186.2114494 253.3895725