condition mean min max ZT0-3 61.75 61.75 61.75 ZT4-7 8.6 8.6 8.6 ZT8-11 20.5 20.5 20.5 ZT12-15 52.85 52.85 52.85 ZT16-19 83.35 83.35 83.35 ZT20-23 62.0 62.0 62.0