condition mean min max ZT0-3 9.966345 9.966345 9.966345 ZT4-7 12.600889 12.600889 12.600889 ZT8-11 10.903878 10.903878 10.903878 ZT12-15 9.998978999999999 9.998978999999999 9.998978999999999 ZT16-19 11.281964 11.281964 11.281964 ZT20-23 11.6004525 11.6004525 11.6004525