condition mean min max ZT0-3 48.75 48.75 48.75 ZT4-7 25.3 25.3 25.3 ZT8-11 34.65 34.65 34.65 ZT12-15 43.15 43.15 43.15 ZT16-19 64.6 64.6 64.6 ZT20-23 68.0 68.0 68.0