condition mean min max ZT0-3 1.7632280792500001 1.3374897705 2.1889663880000003 ZT4-7 0.601773093 0.527722099 0.675824087 ZT8-11 1.94999212 0.6239867960000001 3.275997444 ZT12-15 9.0075833875 6.5640702265 11.4510965485 ZT16-19 7.56681559225 7.1302821025 8.003349082 ZT20-23 5.6380722955 5.4111390185 5.865005572499999