condition mean min max ZT0-3 33.45 33.45 33.45 ZT4-7 34.1 34.1 34.1 ZT8-11 29.1 29.1 29.1 ZT12-15 5.55 5.55 5.55 ZT16-19 36.300000000000004 36.300000000000004 36.300000000000004 ZT20-23 17.45 17.45 17.45