condition mean min max ZT0-3 11.2733 11.2733 11.2733 ZT4-7 14.0139015 14.0139015 14.0139015 ZT8-11 11.476813499999999 11.476813499999999 11.476813499999999 ZT12-15 11.078492 11.078492 11.078492 ZT16-19 16.8846045 16.8846045 16.8846045 ZT20-23 12.959769999999999 12.959769999999999 12.959769999999999