condition mean min max ZT0-3 32.45 32.45 32.45 ZT4-7 39.3 39.3 39.3 ZT8-11 40.400000000000006 40.400000000000006 40.400000000000006 ZT12-15 40.35 40.35 40.35 ZT16-19 18.0 18.0 18.0 ZT20-23 23.0 23.0 23.0