condition mean min max ZT0-3 5.127665 4.452595 5.802735 ZT4-7 4.27797 4.27797 4.27797 ZT8-11 3.6585400000000003 3.6585400000000003 3.6585400000000003 ZT12-15 0 0 0 ZT16-19 6.275105 6.275105 6.275105 ZT20-23 5.842715 5.842715 5.842715