condition mean min max ZT0-3 46.95 46.95 46.95 ZT4-7 11.2 11.2 11.2 ZT8-11 36.15 36.15 36.15 ZT12-15 51.099999999999994 51.099999999999994 51.099999999999994 ZT16-19 57.0 57.0 57.0 ZT20-23 45.4 45.4 45.4