condition mean min max ZT0-3 9.620816 9.620816 9.620816 ZT4-7 9.7147585 9.7147585 9.7147585 ZT8-11 9.0039735 9.0039735 9.0039735 ZT12-15 9.328104 9.328104 9.328104 ZT16-19 9.9535515 9.9535515 9.9535515 ZT20-23 9.659751499999999 9.659751499999999 9.659751499999999