condition mean min max ZT0-3 84.438934 84.438934 84.438934 ZT4-7 67.436643 67.436643 67.436643 ZT8-11 106.582457 106.582457 106.582457 ZT12-15 113.042187 113.042187 113.042187 ZT16-19 150.3369405 150.3369405 150.3369405 ZT20-23 121.697462 121.697462 121.697462