condition mean min max ZT0-3 4.29417402275 4.0370432135000005 4.551304832 ZT4-7 1.41442686625 1.274682543 1.5541711895 ZT8-11 2.3492582090000003 1.867706814 2.830809604 ZT12-15 3.84435237675 2.9356784855 4.753026268 ZT16-19 3.0528309067499997 2.7179677805 3.387694033 ZT20-23 3.640792374 3.5342617580000004 3.74732299