condition mean min max ZT0-3 30.400000000000002 30.400000000000002 30.400000000000002 ZT4-7 61.2 61.2 61.2 ZT8-11 31.549999999999997 31.549999999999997 31.549999999999997 ZT12-15 62.1 62.1 62.1 ZT16-19 55.949999999999996 55.949999999999996 55.949999999999996 ZT20-23 44.2 44.2 44.2