condition mean min max ZT0-3 12.693 12.693 12.693 ZT4-7 9.301085 9.301085 9.301085 ZT8-11 9.36666 9.36666 9.36666 ZT12-15 11.134525 11.134525 11.134525 ZT16-19 19.51715 19.51715 19.51715 ZT20-23 15.04195 15.04195 15.04195