condition mean min max ZT0-3 5.9577675 5.72462 6.190915 ZT4-7 7.358415000000001 7.358415000000001 7.358415000000001 ZT8-11 6.799 6.799 6.799 ZT12-15 0 0 0 ZT16-19 8.05041 8.05041 8.05041 ZT20-23 7.012935 7.012935 7.012935