condition mean min max ZT0-3 6.5746225 5.917165 7.23208 ZT4-7 6.678705 6.678705 6.678705 ZT8-11 16.6519 16.6519 16.6519 ZT12-15 0 0 0 ZT16-19 16.79875 16.79875 16.79875 ZT20-23 12.70185 12.70185 12.70185