condition mean min max ZT0-3 25.75 25.75 25.75 ZT4-7 41.2 41.2 41.2 ZT8-11 39.45 39.45 39.45 ZT12-15 45.55 45.55 45.55 ZT16-19 51.900000000000006 51.900000000000006 51.900000000000006 ZT20-23 39.0 39.0 39.0