condition mean min max ZT0-3 15.475074602500001 12.651729300000001 18.298419905 ZT4-7 17.6839724025 14.27495459 21.092990215 ZT8-11 30.9079689575 27.431030909999997 34.384907005 ZT12-15 35.8443834475 33.19499758 38.493769315 ZT16-19 49.0088708475 44.80825495 53.209486745 ZT20-23 34.30082673 27.39390143 41.207752029999995