condition mean min max ZT0-3 11.4293 11.4293 11.4293 ZT4-7 8.380695 8.380695 8.380695 ZT8-11 7.586655 7.586655 7.586655 ZT12-15 7.843764999999999 7.843764999999999 7.843764999999999 ZT16-19 10.6377 10.6377 10.6377 ZT20-23 12.2363 12.2363 12.2363