condition mean min max ZT0-3 3.03044 3.03044 3.03044 ZT4-7 1.761675 1.761675 1.761675 ZT8-11 1.73792 1.73792 1.73792 ZT12-15 2.100165 2.100165 2.100165 ZT16-19 3.43295 3.43295 3.43295 ZT20-23 2.9776949999999998 2.9776949999999998 2.9776949999999998