condition mean min max ZT0-3 5.0451025000000005 4.8312 5.259005 ZT4-7 4.8333900000000005 4.8333900000000005 4.8333900000000005 ZT8-11 5.91497 5.91497 5.91497 ZT12-15 0 0 0 ZT16-19 14.661200000000001 14.661200000000001 14.661200000000001 ZT20-23 7.717495 7.717495 7.717495