condition mean min max ZT0-3 54.502126 54.502126 54.502126 ZT4-7 66.335422 66.335422 66.335422 ZT8-11 78.2414625 78.2414625 78.2414625 ZT12-15 58.219721500000006 58.219721500000006 58.219721500000006 ZT16-19 82.4321175 82.4321175 82.4321175 ZT20-23 74.7457685 74.7457685 74.7457685