condition mean min max ZT0-3 309.820116 309.820116 309.820116 ZT4-7 413.3970405 413.3970405 413.3970405 ZT8-11 326.0012945 326.0012945 326.0012945 ZT12-15 351.427374 351.427374 351.427374 ZT16-19 313.47294850000003 313.47294850000003 313.47294850000003 ZT20-23 269.611187 269.611187 269.611187