condition mean min max ZT0-3 19.509149999999998 19.509149999999998 19.509149999999998 ZT4-7 14.21275 14.21275 14.21275 ZT8-11 16.59495 16.59495 16.59495 ZT12-15 17.3784 17.3784 17.3784 ZT16-19 23.4145 23.4145 23.4145 ZT20-23 20.2009 20.2009 20.2009