condition mean min max ZT0-3 10.7229 10.7229 10.7229 ZT4-7 8.863949999999999 8.863949999999999 8.863949999999999 ZT8-11 6.8655 6.8655 6.8655 ZT12-15 7.85928 7.85928 7.85928 ZT16-19 9.249805 9.249805 9.249805 ZT20-23 9.378499999999999 9.378499999999999 9.378499999999999