condition mean min max ZT0-3 47.150000000000006 47.150000000000006 47.150000000000006 ZT4-7 5.0 5.0 5.0 ZT8-11 33.35 33.35 33.35 ZT12-15 28.05 28.05 28.05 ZT16-19 59.2 59.2 59.2 ZT20-23 74.9 74.9 74.9