condition mean min max ZT0-3 11.700045 10.32314 13.07695 ZT4-7 4.70934 4.70934 4.70934 ZT8-11 5.730145 5.730145 5.730145 ZT12-15 0 0 0 ZT16-19 8.851225 8.851225 8.851225 ZT20-23 6.48193 6.48193 6.48193