condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 9.222942 9.222942 9.222942 ZT8-11 10.72382 10.72382 10.72382 ZT12-15 9.7957355 9.7957355 9.7957355 ZT16-19 10.086035 10.086035 10.086035 ZT20-23 10.773830499999999 10.773830499999999 10.773830499999999