condition mean min max ZT0-3 36.708097837500006 33.40754907 40.008646605 ZT4-7 12.532611947 10.003755813000001 15.061468081 ZT8-11 11.93936390725 7.5972470585 16.281480756 ZT12-15 17.8599341825 16.594543565000002 19.1253248 ZT16-19 17.6001795725 15.199734840000001 20.000624305 ZT20-23 25.3652828875 24.85726872 25.873297055000002