condition mean min max ZT0-3 22.5 22.5 22.5 ZT4-7 44.6 44.6 44.6 ZT8-11 26.400000000000002 26.400000000000002 26.400000000000002 ZT12-15 39.900000000000006 39.900000000000006 39.900000000000006 ZT16-19 41.8 41.8 41.8 ZT20-23 34.6 34.6 34.6