condition mean min max ZT0-3 0.424278 0.2220745 0.636428 ZT4-7 0.5588885 0.5588885 0.5588885 ZT8-11 0.628398 0.628398 0.628398 ZT12-15 0.160806 0.1600905 0.16152149999999998 ZT16-19 0.0488438 0.0488438 0.0488438 ZT20-23 0.279687 0.279687 0.279687