condition mean min max ZT0-3 11.124131044999999 10.40940461 11.83885748 ZT4-7 8.7839955255 8.500793235 9.067197816 ZT8-11 10.557356878 9.7547053015 11.360008454499999 ZT12-15 6.15696783575 5.6688873475 6.645048323999999 ZT16-19 10.724715072750001 9.6148772115 11.834552934000001 ZT20-23 13.147375065 12.63329456 13.661455570000001