condition mean min max ZT0-3 8.7165925 8.52044 8.912745000000001 ZT4-7 10.531715 10.531715 10.531715 ZT8-11 4.905385 4.905385 4.905385 ZT12-15 0 0 0 ZT16-19 7.209435 7.209435 7.209435 ZT20-23 11.71045 11.71045 11.71045