condition mean min max ZT0-3 47.68385 47.68385 47.68385 ZT4-7 45.1746 45.1746 45.1746 ZT8-11 28.360100000000003 28.360100000000003 28.360100000000003 ZT12-15 34.2484 34.2484 34.2484 ZT16-19 46.06315 46.06315 46.06315 ZT20-23 42.909549999999996 42.909549999999996 42.909549999999996