condition mean min max ZT0-3 1.7091832449999997 0.446291062 2.9720754279999997 ZT4-7 10.462171368 8.053605981 12.870736755 ZT8-11 14.711964595000001 13.87839087 15.54553832 ZT12-15 18.3429170675 18.252497995 18.43333614 ZT16-19 16.921326852500002 15.582532515 18.26012119 ZT20-23 12.9176021275 12.730455815 13.104748440000002