condition mean min max ZT0-3 51.400000000000006 51.400000000000006 51.400000000000006 ZT4-7 31.5 31.5 31.5 ZT8-11 54.75 54.75 54.75 ZT12-15 57.25 57.25 57.25 ZT16-19 73.6 73.6 73.6 ZT20-23 63.7 63.7 63.7