condition mean min max ZT0-3 1.6888810212499998 1.0070385975 2.370723445 ZT4-7 4.06236673375 2.019991452 6.1047420155 ZT8-11 22.4750305385 17.321135667 27.62892541 ZT12-15 36.07144223 35.21022139 36.93266307 ZT16-19 19.353018665 19.135315815 19.570721515000002 ZT20-23 16.63386842 16.037146465 17.230590375