condition mean min max ZT0-3 10.795099 10.795099 10.795099 ZT4-7 11.660999 11.660999 11.660999 ZT8-11 11.743251 11.743251 11.743251 ZT12-15 11.765741 11.765741 11.765741 ZT16-19 11.60428 11.60428 11.60428 ZT20-23 12.285103 12.285103 12.285103