condition mean min max ZT0-3 5.322855000000001 5.322855000000001 5.322855000000001 ZT4-7 3.7681000000000004 3.7681000000000004 3.7681000000000004 ZT8-11 4.14481 4.14481 4.14481 ZT12-15 4.865220000000001 4.865220000000001 4.865220000000001 ZT16-19 5.71371 5.71371 5.71371 ZT20-23 5.1026299999999996 5.1026299999999996 5.1026299999999996