condition mean min max ZT0-3 2.70604927575 2.515687719 2.8964108325 ZT4-7 7.647299351 5.1509423210000005 10.143656381 ZT8-11 15.927767761750001 13.463604423500001 18.3919311 ZT12-15 10.950682186 7.8668515405 14.034512831499999 ZT16-19 5.5010681980000005 5.193058497 5.809077899 ZT20-23 7.6499928985 7.3952403915 7.9047454055