condition mean min max ZT0-3 19.5 19.5 19.5 ZT4-7 8.4 8.4 8.4 ZT8-11 20.3 20.3 20.3 ZT12-15 107.1 107.1 107.1 ZT16-19 72.25 72.25 72.25 ZT20-23 57.2 57.2 57.2