condition mean min max ZT0-3 43.6 43.6 43.6 ZT4-7 24.1 24.1 24.1 ZT8-11 46.400000000000006 46.400000000000006 46.400000000000006 ZT12-15 53.6 53.6 53.6 ZT16-19 67.45 67.45 67.45 ZT20-23 55.05 55.05 55.05