condition mean min max ZT0-3 14.577886 14.577886 14.577886 ZT4-7 13.816148 13.816148 13.816148 ZT8-11 14.131859 14.131859 14.131859 ZT12-15 13.860181 13.860181 13.860181 ZT16-19 14.189017499999999 14.189017499999999 14.189017499999999 ZT20-23 15.554020999999999 15.554020999999999 15.554020999999999