condition mean min max ZT0-3 11.6527 11.6527 11.6527 ZT4-7 8.64724 8.64724 8.64724 ZT8-11 9.290379999999999 9.290379999999999 9.290379999999999 ZT12-15 9.532945 9.532945 9.532945 ZT16-19 11.9295 11.9295 11.9295 ZT20-23 12.9292 12.9292 12.9292