condition mean min max ZT0-3 6.0182275 5.71964 6.316815 ZT4-7 5.50359 5.50359 5.50359 ZT8-11 6.708905 6.708905 6.708905 ZT12-15 0 0 0 ZT16-19 20.10755 20.10755 20.10755 ZT20-23 10.248005 10.248005 10.248005