condition mean min max ZT0-3 45.150000000000006 45.150000000000006 45.150000000000006 ZT4-7 67.9 67.9 67.9 ZT8-11 55.9 55.9 55.9 ZT12-15 26.2 26.2 26.2 ZT16-19 85.85 85.85 85.85 ZT20-23 63.85 63.85 63.85