condition mean min max ZT0-3 30.6 30.6 30.6 ZT4-7 21.5 21.5 21.5 ZT8-11 46.4 46.4 46.4 ZT12-15 59.050000000000004 59.050000000000004 59.050000000000004 ZT16-19 37.4 37.4 37.4 ZT20-23 34.95 34.95 34.95