condition mean min max ZT0-3 32.9 32.9 32.9 ZT4-7 27.3 27.3 27.3 ZT8-11 23.549999999999997 23.549999999999997 23.549999999999997 ZT12-15 39.800000000000004 39.800000000000004 39.800000000000004 ZT16-19 36.15 36.15 36.15 ZT20-23 37.45 37.45 37.45