condition mean min max ZT0-3 25.276463 25.276463 25.276463 ZT4-7 32.7183715 32.7183715 32.7183715 ZT8-11 28.989515500000003 28.989515500000003 28.989515500000003 ZT12-15 23.950079000000002 23.950079000000002 23.950079000000002 ZT16-19 27.3594215 27.3594215 27.3594215 ZT20-23 22.745462000000003 22.745462000000003 22.745462000000003