condition mean min max ZT0-3 6.699999999999999 6.699999999999999 6.699999999999999 ZT4-7 7.0 7.0 7.0 ZT8-11 49.099999999999994 49.099999999999994 49.099999999999994 ZT12-15 13.85 13.85 13.85 ZT16-19 7.4 7.4 7.4 ZT20-23 14.95 14.95 14.95