condition mean min max ZT0-3 73.75 73.75 73.75 ZT4-7 17.2 17.2 17.2 ZT8-11 18.8 18.8 18.8 ZT12-15 71.0 71.0 71.0 ZT16-19 20.6 20.6 20.6 ZT20-23 64.75 64.75 64.75