condition mean min max ZT0-3 0.14270665 0.0627833 0.22263 ZT4-7 0.15981099999999998 0.15981099999999998 0.15981099999999998 ZT8-11 0.09523309999999999 0.09523309999999999 0.09523309999999999 ZT12-15 0 0 0 ZT16-19 0.2815245 0.2815245 0.2815245 ZT20-23 0.3143125 0.3143125 0.3143125