condition mean min max ZT0-3 10.04997313175 8.2243830955 11.875563168 ZT4-7 10.6709563955 8.044679576 13.297233215 ZT8-11 10.790947982333332 8.274488868999999 13.307407095666667 ZT12-15 7.168229921333333 6.392673207333333 7.943786635333334 ZT16-19 10.105798030999999 8.166245614000001 12.045350447999999 ZT20-23 12.251823793833333 11.195193146000001 13.308454441666665