condition mean min max ZT0-3 13.877225 3.799025 25.81055 ZT4-7 4.153595 4.153595 4.153595 ZT8-11 24.046599999999998 24.046599999999998 24.046599999999998 ZT12-15 12.4339225 10.198145 14.669699999999999 ZT16-19 12.92165 12.92165 12.92165 ZT20-23 12.2772 12.2772 12.2772