condition mean min max ZT0-3 13.942174999999999 13.03975 14.8446 ZT4-7 13.2397 13.2397 13.2397 ZT8-11 12.692900000000002 12.692900000000002 12.692900000000002 ZT12-15 0 0 0 ZT16-19 12.9854 12.9854 12.9854 ZT20-23 11.4267 11.4267 11.4267