condition mean min max ZT0-3 0.6315076666666667 0.3368155 1.220285 ZT4-7 0.434798 0.434798 0.434798 ZT8-11 0.6675195 0.6675195 0.6675195 ZT12-15 0.4769755 0.3527395 0.6012115 ZT16-19 0.10766 0.10766 0.10766 ZT20-23 0.476939 0.476939 0.476939