condition mean min max ZT0-3 5.153980000000001 5.153980000000001 5.153980000000001 ZT4-7 3.073185 3.073185 3.073185 ZT8-11 3.713585 3.713585 3.713585 ZT12-15 4.105685 4.105685 4.105685 ZT16-19 6.9124 6.9124 6.9124 ZT20-23 6.03756 6.03756 6.03756