condition mean min max ZT0-3 163.961919 163.961919 163.961919 ZT4-7 200.9465435 200.9465435 200.9465435 ZT8-11 220.9072875 220.9072875 220.9072875 ZT12-15 184.996318 184.996318 184.996318 ZT16-19 273.49177050000003 273.49177050000003 273.49177050000003 ZT20-23 306.30511850000005 306.30511850000005 306.30511850000005