condition mean min max ZT0-3 622.447573 622.447573 622.447573 ZT4-7 268.9352655 268.9352655 268.9352655 ZT8-11 219.1428805 219.1428805 219.1428805 ZT12-15 179.667571 179.667571 179.667571 ZT16-19 288.89455150000003 288.89455150000003 288.89455150000003 ZT20-23 379.0467185 379.0467185 379.0467185