condition mean min max ZT0-3 3.6213550000000003 3.5474550000000002 3.695255 ZT4-7 4.0436700000000005 4.0436700000000005 4.0436700000000005 ZT8-11 4.1444399999999995 4.1444399999999995 4.1444399999999995 ZT12-15 0 0 0 ZT16-19 4.6385000000000005 4.6385000000000005 4.6385000000000005 ZT20-23 4.0942799999999995 4.0942799999999995 4.0942799999999995