condition mean min max ZT0-3 9.353555 9.353555 9.353555 ZT4-7 4.1749600000000004 4.1749600000000004 4.1749600000000004 ZT8-11 3.688275 3.688275 3.688275 ZT12-15 3.6341400000000004 3.6341400000000004 3.6341400000000004 ZT16-19 6.486470000000001 6.486470000000001 6.486470000000001 ZT20-23 11.348600000000001 11.348600000000001 11.348600000000001