condition mean min max ZT0-3 4.827389999999999 4.827389999999999 4.827389999999999 ZT4-7 4.44248 4.44248 4.44248 ZT8-11 3.841875 3.841875 3.841875 ZT12-15 4.020905 4.020905 4.020905 ZT16-19 5.00675 5.00675 5.00675 ZT20-23 4.489595 4.489595 4.489595