condition mean min max ZT0-3 6.366155 3.39303 8.05711 ZT4-7 3.3975150000000003 3.3975150000000003 3.3975150000000003 ZT8-11 9.494465 9.494465 9.494465 ZT12-15 14.748425000000001 14.475850000000001 15.020999999999999 ZT16-19 13.433250000000001 13.433250000000001 13.433250000000001 ZT20-23 11.260549999999999 11.260549999999999 11.260549999999999