condition mean min max ZT0-3 1.7880675000000001 1.72107 1.8550650000000002 ZT4-7 1.877425 1.877425 1.877425 ZT8-11 2.132925 2.132925 2.132925 ZT12-15 0 0 0 ZT16-19 1.999235 1.999235 1.999235 ZT20-23 1.7014 1.7014 1.7014