condition mean min max ZT0-3 7.586633333333334 5.828115 9.087900000000001 ZT4-7 0.0 0.0 0.0 ZT8-11 3.348705 3.348705 3.348705 ZT12-15 10.597005 10.34527 10.84874 ZT16-19 10.664645 10.664645 10.664645 ZT20-23 13.206299999999999 13.206299999999999 13.206299999999999