condition mean min max ZT0-3 484.155239 484.155239 484.155239 ZT4-7 354.700549 354.700549 354.700549 ZT8-11 419.5141975 419.5141975 419.5141975 ZT12-15 348.53387 348.53387 348.53387 ZT16-19 393.4876285 393.4876285 393.4876285 ZT20-23 341.680157 341.680157 341.680157