condition mean min max ZT0-3 182.446198 182.446198 182.446198 ZT4-7 381.482211 381.482211 381.482211 ZT8-11 525.0909405 525.0909405 525.0909405 ZT12-15 386.6532465 386.6532465 386.6532465 ZT16-19 342.98739550000005 342.98739550000005 342.98739550000005 ZT20-23 226.6148015 226.6148015 226.6148015