condition mean min max ZT0-3 29.35 29.35 29.35 ZT4-7 53.0 53.0 53.0 ZT8-11 20.65 20.65 20.65 ZT12-15 52.099999999999994 52.099999999999994 52.099999999999994 ZT16-19 24.75 24.75 24.75 ZT20-23 21.6 21.6 21.6