condition mean min max ZT0-3 11.474887 11.474887 11.474887 ZT4-7 14.1960855 14.1960855 14.1960855 ZT8-11 14.5108815 14.5108815 14.5108815 ZT12-15 14.933660499999998 14.933660499999998 14.933660499999998 ZT16-19 13.744253 13.744253 13.744253 ZT20-23 14.386161999999999 14.386161999999999 14.386161999999999