condition mean min max ZT0-3 39.9 39.9 39.9 ZT4-7 51.2 51.2 51.2 ZT8-11 47.2 47.2 47.2 ZT12-15 62.55 62.55 62.55 ZT16-19 61.75 61.75 61.75 ZT20-23 58.400000000000006 58.400000000000006 58.400000000000006