condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 12.3594505 12.3594505 12.3594505 ZT8-11 10.997630000000001 10.997630000000001 10.997630000000001 ZT12-15 11.233598 11.233598 11.233598 ZT16-19 12.163745500000001 12.163745500000001 12.163745500000001 ZT20-23 13.440918499999999 13.440918499999999 13.440918499999999