condition mean min max ZT0-3 10.75 10.75 10.75 ZT4-7 14.7 14.7 14.7 ZT8-11 46.400000000000006 46.400000000000006 46.400000000000006 ZT12-15 15.350000000000001 15.350000000000001 15.350000000000001 ZT16-19 36.35 36.35 36.35 ZT20-23 62.75 62.75 62.75