condition mean min max ZT0-3 54.0 54.0 54.0 ZT4-7 35.2 35.2 35.2 ZT8-11 81.75 81.75 81.75 ZT12-15 68.85 68.85 68.85 ZT16-19 63.45 63.45 63.45 ZT20-23 55.150000000000006 55.150000000000006 55.150000000000006