condition mean min max ZT0-3 273.620754075 267.8931545 279.34835365 ZT4-7 163.555001725 139.2971448 187.81285865 ZT8-11 108.82424602500001 108.7189434 108.92954865 ZT12-15 89.529250705 77.58066817 101.47783324 ZT16-19 61.288029365 57.57999597 64.99606276 ZT20-23 108.10785178 91.07702386000001 125.1386797