condition mean min max ZT0-3 22.5175859225 14.325943099999998 30.709228745 ZT4-7 15.42997172 13.048063045 17.811880395 ZT8-11 20.722504295 16.61659634 24.82841225 ZT12-15 18.7700562025 12.685155725 24.85495668 ZT16-19 12.760385312499999 11.626959294999999 13.89381133 ZT20-23 16.1220232625 15.46752803 16.776518495