condition mean min max ZT0-3 11.834150000000001 11.834150000000001 11.834150000000001 ZT4-7 9.248709999999999 9.248709999999999 9.248709999999999 ZT8-11 12.09195 12.09195 12.09195 ZT12-15 12.046199999999999 12.046199999999999 12.046199999999999 ZT16-19 15.75435 15.75435 15.75435 ZT20-23 14.0576 14.0576 14.0576