condition mean min max ZT0-3 111.9 111.9 111.9 ZT4-7 129.4 129.4 129.4 ZT8-11 158.65 158.65 158.65 ZT12-15 167.7 167.7 167.7 ZT16-19 163.2 163.2 163.2 ZT20-23 136.4 136.4 136.4