condition mean min max ZT0-3 7.1080825 6.621544999999999 7.594620000000001 ZT4-7 4.333825 4.333825 4.333825 ZT8-11 5.40364 5.40364 5.40364 ZT12-15 0 0 0 ZT16-19 7.61285 7.61285 7.61285 ZT20-23 5.9965150000000005 5.9965150000000005 5.9965150000000005