condition mean min max ZT0-3 15.680384499999999 1.4348535 27.6956 ZT4-7 0.609468 0.609468 0.609468 ZT8-11 3.520365 3.520365 3.520365 ZT12-15 11.702929999999999 4.53991 18.865949999999998 ZT16-19 23.90565 23.90565 23.90565 ZT20-23 20.2782 20.2782 20.2782