condition mean min max ZT0-3 25.2 25.2 25.2 ZT4-7 40.6 40.6 40.6 ZT8-11 20.85 20.85 20.85 ZT12-15 34.900000000000006 34.900000000000006 34.900000000000006 ZT16-19 41.95 41.95 41.95 ZT20-23 42.4 42.4 42.4