condition mean min max ZT0-3 284.701834 284.701834 284.701834 ZT4-7 353.625323 353.625323 353.625323 ZT8-11 307.00072 307.00072 307.00072 ZT12-15 314.9655395 314.9655395 314.9655395 ZT16-19 113.84754899999999 113.84754899999999 113.84754899999999 ZT20-23 77.0525375 77.0525375 77.0525375