condition mean min max ZT0-3 6.946693333333333 4.61373 9.19004 ZT4-7 3.897055 3.897055 3.897055 ZT8-11 5.390125 5.390125 5.390125 ZT12-15 9.107355 8.51321 9.7015 ZT16-19 10.56595 10.56595 10.56595 ZT20-23 10.50165 10.50165 10.50165