condition mean min max ZT0-3 12.11496 12.11496 12.11496 ZT4-7 15.918163 15.918163 15.918163 ZT8-11 14.720589499999999 14.720589499999999 14.720589499999999 ZT12-15 13.9308605 13.9308605 13.9308605 ZT16-19 15.367941 15.367941 15.367941 ZT20-23 14.717907 14.717907 14.717907