condition mean min max ZT0-3 3.7282675000000003 3.5486750000000002 3.90786 ZT4-7 3.711105 3.711105 3.711105 ZT8-11 2.6780850000000003 2.6780850000000003 2.6780850000000003 ZT12-15 0 0 0 ZT16-19 3.9433 3.9433 3.9433 ZT20-23 4.064575 4.064575 4.064575