condition mean min max ZT0-3 12.368400000000001 12.368400000000001 12.368400000000001 ZT4-7 9.695015 9.695015 9.695015 ZT8-11 8.944614999999999 8.944614999999999 8.944614999999999 ZT12-15 10.6804 10.6804 10.6804 ZT16-19 14.28355 14.28355 14.28355 ZT20-23 11.99645 11.99645 11.99645