condition mean min max ZT0-3 7.81874639375 3.636828822 12.0006639655 ZT4-7 17.5939138675 15.704407675 19.48342006 ZT8-11 20.931543885 20.763308950000003 21.099778819999997 ZT12-15 35.637164437500005 26.883639575000004 44.390689300000005 ZT16-19 43.20311639 42.966148149999995 43.44008463 ZT20-23 32.1154001575 30.117282385 34.11351793