condition mean min max ZT0-3 10.186685 10.186685 10.186685 ZT4-7 9.5111255 9.5111255 9.5111255 ZT8-11 11.303755500000001 11.303755500000001 11.303755500000001 ZT12-15 12.9913685 12.9913685 12.9913685 ZT16-19 11.091143500000001 11.091143500000001 11.091143500000001 ZT20-23 9.052465999999999 9.052465999999999 9.052465999999999