condition mean min max ZT0-3 5.644315000000001 5.30788 5.9807500000000005 ZT4-7 3.49415 3.49415 3.49415 ZT8-11 3.38232 3.38232 3.38232 ZT12-15 0 0 0 ZT16-19 5.273735 5.273735 5.273735 ZT20-23 9.977535 9.977535 9.977535