condition mean min max ZT0-3 5.199294999999999 5.199294999999999 5.199294999999999 ZT4-7 3.00375 3.00375 3.00375 ZT8-11 5.012535 5.012535 5.012535 ZT12-15 6.275155 6.275155 6.275155 ZT16-19 7.143675 7.143675 7.143675 ZT20-23 6.618545 6.618545 6.618545