condition mean min max ZT0-3 25.8078 25.8078 25.8078 ZT4-7 26.3872 26.3872 26.3872 ZT8-11 21.9598 21.9598 21.9598 ZT12-15 20.1348 20.1348 20.1348 ZT16-19 26.903100000000002 26.903100000000002 26.903100000000002 ZT20-23 22.51735 22.51735 22.51735