condition mean min max ZT0-3 9.307627499999999 6.433005 12.18225 ZT4-7 3.239575 3.239575 3.239575 ZT8-11 3.064225 3.064225 3.064225 ZT12-15 0 0 0 ZT16-19 2.962605 2.962605 2.962605 ZT20-23 4.259195 4.259195 4.259195