condition mean min max ZT0-3 56.207418 56.207418 56.207418 ZT4-7 40.341312 40.341312 40.341312 ZT8-11 9.725083999999999 9.725083999999999 9.725083999999999 ZT12-15 12.695254 12.695254 12.695254 ZT16-19 10.543191 10.543191 10.543191 ZT20-23 9.541644 9.541644 9.541644