condition mean min max ZT0-3 9.431114999999998 8.79891 10.06332 ZT4-7 10.32798 10.32798 10.32798 ZT8-11 12.784600000000001 12.784600000000001 12.784600000000001 ZT12-15 13.461736666666667 12.61914 14.304333333333334 ZT16-19 11.966545 10.89359 13.0395 ZT20-23 0 0 0