condition mean min max ZT0-3 16.50216255 15.763814000000002 17.2405111 ZT4-7 13.49702624725 11.3359475595 15.658104935 ZT8-11 21.9445364375 18.07204715 25.817025725 ZT12-15 17.419138095 15.44849904 19.38977715 ZT16-19 11.440093735249999 10.8588934605 12.02129401 ZT20-23 14.7974519475 14.111246265 15.48365763