condition mean min max ZT0-3 3.993535 3.993535 3.993535 ZT4-7 3.0359350000000003 3.0359350000000003 3.0359350000000003 ZT8-11 2.086325 2.086325 2.086325 ZT12-15 3.0853399999999995 3.0853399999999995 3.0853399999999995 ZT16-19 7.30517 7.30517 7.30517 ZT20-23 5.3149999999999995 5.3149999999999995 5.3149999999999995