condition mean min max ZT0-3 15.22328 15.22328 15.22328 ZT4-7 14.5868045 14.5868045 14.5868045 ZT8-11 14.74738 14.74738 14.74738 ZT12-15 14.566447 14.566447 14.566447 ZT16-19 14.1201765 14.1201765 14.1201765 ZT20-23 14.041128 14.041128 14.041128