condition mean min max ZT0-3 46.900000000000006 46.900000000000006 46.900000000000006 ZT4-7 66.1 66.1 66.1 ZT8-11 49.7 49.7 49.7 ZT12-15 61.55 61.55 61.55 ZT16-19 87.35000000000001 87.35000000000001 87.35000000000001 ZT20-23 78.9 78.9 78.9