condition mean min max ZT0-3 74.388068 74.388068 74.388068 ZT4-7 68.3872215 68.3872215 68.3872215 ZT8-11 60.385813 60.385813 60.385813 ZT12-15 55.957497000000004 55.957497000000004 55.957497000000004 ZT16-19 56.8400145 56.8400145 56.8400145 ZT20-23 60.448124 60.448124 60.448124