condition mean min max ZT0-3 50.004318 50.004318 50.004318 ZT4-7 45.409657499999994 45.409657499999994 45.409657499999994 ZT8-11 41.831880999999996 41.831880999999996 41.831880999999996 ZT12-15 40.1337535 40.1337535 40.1337535 ZT16-19 42.346025 42.346025 42.346025 ZT20-23 38.847209 38.847209 38.847209