condition mean min max ZT0-3 34.300000000000004 34.300000000000004 34.300000000000004 ZT4-7 26.2 26.2 26.2 ZT8-11 11.95 11.95 11.95 ZT12-15 43.3 43.3 43.3 ZT16-19 36.2 36.2 36.2 ZT20-23 39.75 39.75 39.75