condition mean min max ZT0-3 1.16218080775 0.450501355 1.8738602604999999 ZT4-7 6.21559428575 4.5690035805 7.8621849909999995 ZT8-11 16.912961999 13.740598858 20.085325140000002 ZT12-15 10.061221577 7.124602647 12.997840507 ZT16-19 5.98389282925 5.543468859000001 6.4243167995 ZT20-23 4.3501326415 4.2250338905 4.4752313925