condition mean min max ZT0-3 84.25 84.25 84.25 ZT4-7 117.4 117.4 117.4 ZT8-11 93.8 93.8 93.8 ZT12-15 81.05 81.05 81.05 ZT16-19 68.8 68.8 68.8 ZT20-23 34.1 34.1 34.1