condition mean min max ZT0-3 241.10000000000002 241.10000000000002 241.10000000000002 ZT4-7 263.1 263.1 263.1 ZT8-11 171.6 171.6 171.6 ZT12-15 158.1 158.1 158.1 ZT16-19 163.8 163.8 163.8 ZT20-23 223.8 223.8 223.8