condition mean min max ZT0-3 21.862833333333334 21.862833333333334 21.862833333333334 ZT4-7 20.332349999999998 20.332349999999998 20.332349999999998 ZT8-11 13.396899999999999 13.396899999999999 13.396899999999999 ZT12-15 10.727605 10.727605 10.727605 ZT16-19 13.133 13.133 13.133 ZT20-23 19.985 19.985 19.985