condition mean min max ZT0-3 22.25 22.25 22.25 ZT4-7 31.9 31.9 31.9 ZT8-11 42.15 42.15 42.15 ZT12-15 72.30000000000001 72.30000000000001 72.30000000000001 ZT16-19 48.099999999999994 48.099999999999994 48.099999999999994 ZT20-23 30.45 30.45 30.45