condition mean min max ZT0-3 261.95 261.95 261.95 ZT4-7 287.5 287.5 287.5 ZT8-11 168.2 168.2 168.2 ZT12-15 154.0 154.0 154.0 ZT16-19 170.60000000000002 170.60000000000002 170.60000000000002 ZT20-23 213.8 213.8 213.8