condition mean min max ZT0-3 32.54195 26.000500000000002 39.0834 ZT4-7 26.70815 26.70815 26.70815 ZT8-11 20.713 20.713 20.713 ZT12-15 0 0 0 ZT16-19 21.46845 21.46845 21.46845 ZT20-23 25.212 25.212 25.212