condition mean min max ZT0-3 10.709458 10.709458 10.709458 ZT4-7 11.20477 11.20477 11.20477 ZT8-11 12.908834500000001 12.908834500000001 12.908834500000001 ZT12-15 10.6384915 10.6384915 10.6384915 ZT16-19 15.334262 15.334262 15.334262 ZT20-23 14.4877355 14.4877355 14.4877355