condition mean min max ZT0-3 73.9 73.9 73.9 ZT4-7 73.2 73.2 73.2 ZT8-11 62.7 62.7 62.7 ZT12-15 63.650000000000006 63.650000000000006 63.650000000000006 ZT16-19 30.7 30.7 30.7 ZT20-23 62.900000000000006 62.900000000000006 62.900000000000006