condition mean min max ZT0-3 106.7 106.7 106.7 ZT4-7 56.7 56.7 56.7 ZT8-11 107.6 107.6 107.6 ZT12-15 129.85 129.85 129.85 ZT16-19 158.8 158.8 158.8 ZT20-23 148.25 148.25 148.25