condition mean min max ZT0-3 91.834225 90.41035 93.2581 ZT4-7 128.326 128.326 128.326 ZT8-11 59.777150000000006 59.777150000000006 59.777150000000006 ZT12-15 0 0 0 ZT16-19 41.864000000000004 41.864000000000004 41.864000000000004 ZT20-23 79.9969 79.9969 79.9969