condition mean min max ZT0-3 0.39974716666666665 0.318009 0.514354 ZT4-7 0.2669885 0.2669885 0.2669885 ZT8-11 0.41331 0.41331 0.41331 ZT12-15 0.63088475 0.624679 0.6370905 ZT16-19 0.830311 0.830311 0.830311 ZT20-23 0.789774 0.789774 0.789774