condition mean min max ZT0-3 3.8991800000000003 3.8991800000000003 3.8991800000000003 ZT4-7 4.268505 4.268505 4.268505 ZT8-11 2.526455 2.526455 2.526455 ZT12-15 3.019895 3.019895 3.019895 ZT16-19 3.42147 3.42147 3.42147 ZT20-23 2.6570150000000003 2.6570150000000003 2.6570150000000003