condition mean min max ZT0-3 49.85 49.85 49.85 ZT4-7 32.0 32.0 32.0 ZT8-11 54.0 54.0 54.0 ZT12-15 55.150000000000006 55.150000000000006 55.150000000000006 ZT16-19 34.05 34.05 34.05 ZT20-23 37.95 37.95 37.95