condition mean min max ZT0-3 133.85 133.85 133.85 ZT4-7 172.1 172.1 172.1 ZT8-11 131.3 131.3 131.3 ZT12-15 162.9 162.9 162.9 ZT16-19 163.89999999999998 163.89999999999998 163.89999999999998 ZT20-23 146.60000000000002 146.60000000000002 146.60000000000002