condition mean min max ZT0-3 0.12968933333333335 0.0675375 0.190148 ZT4-7 0.319169 0.319169 0.319169 ZT8-11 0.5217395 0.5217395 0.5217395 ZT12-15 0.84573925 0.4621735 1.229305 ZT16-19 0.36946599999999996 0.36946599999999996 0.36946599999999996 ZT20-23 0.6989624999999999 0.6989624999999999 0.6989624999999999