condition mean min max ZT0-3 50.81570000000001 45.844750000000005 55.78665 ZT4-7 10.81519 10.81519 10.81519 ZT8-11 11.7914 11.7914 11.7914 ZT12-15 0 0 0 ZT16-19 76.9864 76.9864 76.9864 ZT20-23 72.0469 72.0469 72.0469