condition mean min max ZT0-3 1.268321 1.268321 1.268321 ZT4-7 1.22275 1.22275 1.22275 ZT8-11 1.1290655 1.1290655 1.1290655 ZT12-15 1.6427399999999999 1.6427399999999999 1.6427399999999999 ZT16-19 2.99176 2.99176 2.99176 ZT20-23 2.035915 2.035915 2.035915