condition mean min max ZT0-3 1.3942016666666666 1.197015 1.6146449999999999 ZT4-7 0.429377 0.429377 0.429377 ZT8-11 0.3403555 0.3403555 0.3403555 ZT12-15 0.93187975 0.8861095000000001 0.9776499999999999 ZT16-19 0.7485005 0.7485005 0.7485005 ZT20-23 1.460205 1.460205 1.460205