condition mean min max ZT0-3 9.422922499999999 7.94591 10.899935 ZT4-7 19.648000000000003 19.648000000000003 19.648000000000003 ZT8-11 8.994309999999999 8.994309999999999 8.994309999999999 ZT12-15 0 0 0 ZT16-19 8.504950000000001 8.504950000000001 8.504950000000001 ZT20-23 10.801075 10.801075 10.801075