condition mean min max ZT0-3 0.7017413333333333 0.6153385 0.7698275 ZT4-7 1.281405 1.281405 1.281405 ZT8-11 1.22595 1.22595 1.22595 ZT12-15 3.0830200000000003 2.0752300000000004 4.09081 ZT16-19 2.71127 2.71127 2.71127 ZT20-23 1.268675 1.268675 1.268675