condition mean min max ZT0-3 10.282545 9.43037 10.8322 ZT4-7 7.002435 7.002435 7.002435 ZT8-11 7.168775 7.168775 7.168775 ZT12-15 13.53975 13.0989 13.980599999999999 ZT16-19 12.770199999999999 12.770199999999999 12.770199999999999 ZT20-23 12.158100000000001 12.158100000000001 12.158100000000001