condition mean min max ZT0-3 12.504975 12.504975 12.504975 ZT4-7 13.937419 13.937419 13.937419 ZT8-11 10.831964 10.831964 10.831964 ZT12-15 12.0981505 12.0981505 12.0981505 ZT16-19 12.086692 12.086692 12.086692 ZT20-23 12.0983725 12.0983725 12.0983725