condition mean min max ZT0-3 52.8472 47.39405 58.30035 ZT4-7 59.50775 59.50775 59.50775 ZT8-11 41.06285 41.06285 41.06285 ZT12-15 0 0 0 ZT16-19 68.67875000000001 68.67875000000001 68.67875000000001 ZT20-23 84.83035000000001 84.83035000000001 84.83035000000001