condition mean min max ZT0-3 229.924364 229.924364 229.924364 ZT4-7 226.8321585 226.8321585 226.8321585 ZT8-11 214.6421075 214.6421075 214.6421075 ZT12-15 242.4331525 242.4331525 242.4331525 ZT16-19 247.4887675 247.4887675 247.4887675 ZT20-23 287.413163 287.413163 287.413163